Head-to-head comparison

Claude Opus 4.6 vs. Mistral Medium 3.5

Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.

shared result series: 27
distinct benchmark metrics: 5
latest retrieval: 2026-10-16

First modelSecond model

Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for Claude Opus 4.6 and Mistral Medium 3.5
Attribute	Claude Opus 4.6	Mistral Medium 3.5
Provider	Anthropic	Mistral AI
Released	Feb 2026	Apr 28, 2026
Availability	Active	Active
Model type	Proprietary	Open Weights
Parameters	Not published	128B
Architecture	Not published	Dense
Context window	1,000,000 tokens	262,144 tokens
Knowledge cutoff	May 2025	Not published
Technical sources	Model, Context	Model, Context

Pricing

API pricing compared

The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.

API pricing for Claude Opus 4.6 and Mistral Medium 3.5
Price type	Claude Opus 4.6	Mistral Medium 3.5
API input	$5	$1.5
API output	$25	$7.5
Cache read	$0.5	Not listed
Cache write (5 min.)	$6.25	Not listed
Cache write (1 hr.)	$10	Not listed
Price verified	09/22/2026 Source	09/22/2026 Source

Claude Opus 4.6Mistral Medium 3.5

API inputUSD per 1M tokens, base tier

Claude Opus 4.6$5

Mistral Medium 3.5$1.5

API outputUSD per 1M tokens, base tier

Claude Opus 4.6$25

Mistral Medium 3.5$7.5

Key to the marks:better valuebetter, but not conclusivetie

Pricing by provider

Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.

Provider pricing for Claude Opus 4.6 and Mistral Medium 3.5
Model	Provider	Purchase route and tariff	Input per 1M tokens	Output per 1M tokens	Source
Claude Opus 4.6	Anthropic	Direct from developerStandard API	Lowest listed price: $5	Lowest listed price: $25	Source09/22/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Anthropic	Via OpenRouteranthropic	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Azure	Via OpenRouterazure/global	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Claude Platform on AWS	Via OpenRouterclaude-on-aws	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Google	Via OpenRoutergoogle-vertex/europe	$5.5	$27.5	Source10/26/2026
	Google	Via OpenRoutergoogle-vertex/global	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
Mistral Medium 3.5	Mistral AI	Direct from developerStandard API	Lowest listed price: $1.5	Lowest listed price: $7.5	Source09/22/2026
	Mistral	Via OpenRoutermistral	Lowest listed price: $1.5	Lowest listed price: $7.5	Source10/26/2026
	Mistral	Via OpenRoutermistral/eu	$1.65	$8.25	Source10/26/2026
	Mistral	Via OpenRoutermistral/zdr	Lowest listed price: $1.5	Lowest listed price: $7.5	Source10/26/2026

Benchmark index

Benchmark index compared

The index combines independent benchmarks on a scale from 0 to 100. A lead only counts when a model comes first in at least 95% of 200 recalculations with randomly redrawn test families. Otherwise both count as level.

Open the AI leaderboard

Claude Opus 4.6

Overall index

No overall score yet

Mistral Medium 3.5

Overall index

below 1

Claude Opus 4.6 leads in 5 of 5 shared areas.

Area	Claude Opus 4.6	Mistral Medium 3.5
Coding	43.8	below 1
Agents	48.0	below 1
Finance	72.9	below 1
Legal	71.5	below 1
Health	63.0	below 1

Performance

Shared benchmarks

Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.

Capability profile from matched benchmarks

Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.

Not enough directly matched categories for a reliable radar

Only 2 of at least 5 categories have comparable, direct model measurements. The benchmark tables below show the available evidence without filling missing axes.

Claude Opus 4.6Mistral Medium 3.5

LMArena Code Arena WebDevOverall. Higher is better. No documented setup difference

Claude Opus 4.61,537.258

Mistral Medium 3.51,263.383

LMArena Vision, Style ControlOverall. Higher is better. No documented setup difference

Claude Opus 4.61,294.46

Mistral Medium 3.51,200.386

MedCodeOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.648.244 %

Mistral Medium 3.533.752 %

MedScribeOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.686.738 %

Mistral Medium 3.567.728 %

Vibe Code Bench v1.1Overall. Higher is better. Test setup not documented as identical

Claude Opus 4.657.573 %

Mistral Medium 3.52.888 %

LMArena Code Arena WebDevOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.61,546.362

Mistral Medium 3.51,263.383

LMArena Vision, Style ControlOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.61,299.232

Mistral Medium 3.51,200.386

LMArena Code Arena WebDevWebdev. Higher is better. No documented setup difference

Claude Opus 4.61,537.258

Mistral Medium 3.51,263.383

LMArena Vision, Style ControlChinese. Higher is better. No documented setup difference

Claude Opus 4.61,348.115

Mistral Medium 3.51,216.486

LMArena Code Arena WebDevWebdev. Higher is better. Test setup not documented as identical

Claude Opus 4.61,546.362

Mistral Medium 3.51,263.383

LMArena Vision, Style ControlChinese. Higher is better. Test setup not documented as identical

Claude Opus 4.61,351.953

Mistral Medium 3.51,216.486

LMArena Code Arena WebDevWebdev-html. Higher is better. No documented setup difference

Claude Opus 4.61,546.218

Mistral Medium 3.51,307.357

Key to the marks:better valuebetter, but not conclusivetie

Our model tests

Our tests

SVG short test

One SVG prompt and fixed output settings. Captures are shown only with 0 reported reasoning tokens or documented lack of reasoning controls. Identical test conditions do not make the models' internal compute identical.

Shared test round: 43b8c5c46830

Claude Opus 4.6

Mistral Medium 3.5

Earlier tests

Pelican on a bicycle

A community classic for free-form SVG drawing.

Claude Opus 4.6

Reasoning (requested): high

Current attempt

Run date: Oct 1, 2026
API provider: openrouter
Requested API model: anthropic/claude-opus-4.6
API model reported in response: anthropic/claude-opus-4.6
Reasoning setting: high
Pinned endpoint: Anthropic | anthropic/claude-4.6-opus-20260205
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating
Response time: 85.1 s

Visually reviewed. This individual test does not establish overall model quality.

Mistral Medium 3.5

Reasoning (requested): high

Current attempt

Run date: Oct 1, 2026
API provider: openrouter
Requested API model: mistralai/mistral-medium-3-5
API model reported in response: mistralai/mistral-medium-3-5
Reasoning setting: high
Pinned endpoint: Mistral | mistralai/mistral-medium-3.5-20260430
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating
Response time: 38.7 s

Visually reviewed. This individual test does not establish overall model quality.

Earlier attempts (1)

Sep 7, 2026API request failedReasoning setting: high

Prompt and test conditions

Generate an SVG of a pelican riding a bicycle

Token limit including reasoning: 8,192 tokens

Task origin (Simon Willison)

How to read this comparison

Winning one benchmark is not an overall verdict

Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.

The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.

Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.

More matchups

Compare Claude Opus 4.6 and Mistral Medium 3.5 with other leading models using the same data and benchmark logic.

View the complete LLM comparison

Benchmark scores for Claude Opus 4.6 and Mistral Medium 3.5
Benchmark and task	Claude Opus 4.6	Mistral Medium 3.5	Source
LMArena Code Arena WebDevOverall Test details No documented difference in the test setupVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 20,698 published pairwise votes.Mistral Medium 3.5: Arena rating from 2,320 published pairwise votes.	Winner1,537.258 95% confidence interval: ±5.345The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,263.383 95% confidence interval: ±14.784The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlOverall Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 26,853 published pairwise votes.Mistral Medium 3.5: Arena rating from 5,375 published pairwise votes.	Winner1,294.46 95% confidence interval: ±6.329The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,200.386 95% confidence interval: ±9.604The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
MedCodeOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.6: Compute: max, Temperature: 1, Output limit: 30,000 tokens Mistral Medium 3.5: Reasoning: high, Temperature: 1, Top P: 0.95, Output limit: 30,000 tokens	Higher measured value48.244 %	33.752 %	Vals AI Source details Data as of: 10/13/2026
MedScribeOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.6: Compute: max, Temperature: 1, Output limit: 30,000 tokens Mistral Medium 3.5: Reasoning: high, Temperature: 1, Top P: 0.95, Output limit: 30,000 tokens	Higher measured value86.738 %	67.728 %	Vals AI Source details Data as of: 10/13/2026
Vibe Code Bench v1.1Overall Test details Test setup not documented as identicalNo direct winnerVersion: 1.1Metric: accuracyScoring: Higher is betterClaude Opus 4.6: Compute: max, Harness: OpenHands, Temperature: 1, Output limit: 128,000 tokens Mistral Medium 3.5: Reasoning: high, Harness: OpenHands, Temperature: 0.7, Top P: 0.95, Output limit: 80,000 tokens	Higher measured value57.573 %	2.888 %	Vals AI Source details Data as of: 10/12/2026
LMArena Code Arena WebDevOverall Test details Test setup not documented as identicalNo direct winnerVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 19,443 published pairwise votes.Mistral Medium 3.5: Arena rating from 2,320 published pairwise votes.	Higher measured value1,546.362 95% confidence interval: ±5.46The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,263.383 95% confidence interval: ±14.784The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlOverall Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 22,304 published pairwise votes.Mistral Medium 3.5: Arena rating from 5,375 published pairwise votes.	Higher measured value1,299.232 95% confidence interval: ±6.456The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,200.386 95% confidence interval: ±9.604The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Code Arena WebDevWebdev Test details No documented difference in the test setupVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 20,698 published pairwise votes.Mistral Medium 3.5: Arena rating from 2,320 published pairwise votes.	Winner1,537.258 95% confidence interval: ±5.345The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,263.383 95% confidence interval: ±14.784The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlChinese Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 1,685 published pairwise votes.Mistral Medium 3.5: Arena rating from 288 published pairwise votes.	Winner1,348.115 95% confidence interval: ±17.347The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,216.486 95% confidence interval: ±38.816The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Code Arena WebDevWebdev Test details Test setup not documented as identicalNo direct winnerVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 19,443 published pairwise votes.Mistral Medium 3.5: Arena rating from 2,320 published pairwise votes.	Higher measured value1,546.362 95% confidence interval: ±5.46The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,263.383 95% confidence interval: ±14.784The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlChinese Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 1,488 published pairwise votes.Mistral Medium 3.5: Arena rating from 288 published pairwise votes.	Higher measured value1,351.953 95% confidence interval: ±17.967The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,216.486 95% confidence interval: ±38.816The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Code Arena WebDevWebdev-html Test details No documented difference in the test setupVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 2,623 published pairwise votes.Mistral Medium 3.5: Arena rating from 259 published pairwise votes.	Winner1,546.218 95% confidence interval: ±12.521The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,307.357 95% confidence interval: ±41.479The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlCreative writing vision Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 1,731 published pairwise votes.Mistral Medium 3.5: Arena rating from 342 published pairwise votes.	Winner1,297.75 95% confidence interval: ±15.034The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,196.259 95% confidence interval: ±33.621The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Code Arena WebDevWebdev-html Test details Test setup not documented as identicalNo direct winnerVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 2,474 published pairwise votes.Mistral Medium 3.5: Arena rating from 259 published pairwise votes.	Higher measured value1,558.715 95% confidence interval: ±13.217The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,307.357 95% confidence interval: ±41.479The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlCreative writing vision Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 1,405 published pairwise votes.Mistral Medium 3.5: Arena rating from 342 published pairwise votes.	Higher measured value1,309.447 95% confidence interval: ±16.801The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,196.259 95% confidence interval: ±33.621The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Code Arena WebDevWebdev-react Test details No documented difference in the test setupVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 16,319 published pairwise votes.Mistral Medium 3.5: Arena rating from 1,977 published pairwise votes.	Winner1,528.416 95% confidence interval: ±5.908The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,253.399 95% confidence interval: ±16.155The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlDiagram Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 7,260 published pairwise votes.Mistral Medium 3.5: Arena rating from 1,540 published pairwise votes.	Winner1,331.371 95% confidence interval: ±8.825The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,242.126 95% confidence interval: ±16.169The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Code Arena WebDevWebdev-react Test details Test setup not documented as identicalNo direct winnerVersion: webdevMetric: WebDev Arena Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Code Arena WebDev Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Code Arena WebDevClaude Opus 4.6: Arena rating from 15,177 published pairwise votes.Mistral Medium 3.5: Arena rating from 1,977 published pairwise votes.	Higher measured value1,538.872 95% confidence interval: ±6.058The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,253.399 95% confidence interval: ±16.155The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlDiagram Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 5,999 published pairwise votes.Mistral Medium 3.5: Arena rating from 1,540 published pairwise votes.	Higher measured value1,324.675 95% confidence interval: ±9.238The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,242.126 95% confidence interval: ±16.169The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlEnglish Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 11,327 published pairwise votes.Mistral Medium 3.5: Arena rating from 2,316 published pairwise votes.	Winner1,296.058 95% confidence interval: ±8.463The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,216.805 95% confidence interval: ±13.853The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlEnglish Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 9,251 published pairwise votes.Mistral Medium 3.5: Arena rating from 2,316 published pairwise votes.	Higher measured value1,301.128 95% confidence interval: ±8.811The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,216.805 95% confidence interval: ±13.853The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlHomework Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 3,708 published pairwise votes.Mistral Medium 3.5: Arena rating from 805 published pairwise votes.	Winner1,311.92 95% confidence interval: ±10.944The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,217.674 95% confidence interval: ±22.051The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlHomework Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 2,849 published pairwise votes.Mistral Medium 3.5: Arena rating from 805 published pairwise votes.	Higher measured value1,324.17 95% confidence interval: ±12.006The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,217.674 95% confidence interval: ±22.051The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlHumor Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 1,025 published pairwise votes.Mistral Medium 3.5: Arena rating from 237 published pairwise votes.	Winner1,294.209 95% confidence interval: ±19.436The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,197.574 95% confidence interval: ±39.389The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlHumor Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 869 published pairwise votes.Mistral Medium 3.5: Arena rating from 237 published pairwise votes.	Higher measured value1,296.35 95% confidence interval: ±21.068The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,197.574 95% confidence interval: ±39.389The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlOcr Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 19,427 published pairwise votes.Mistral Medium 3.5: Arena rating from 3,904 published pairwise votes.	Winner1,312.247 95% confidence interval: ±6.33The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,215.105 95% confidence interval: ±10.552The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
LMArena Vision, Style ControlOcr Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 4.6: Snapshot: claude-opus-4-6-high, Reasoning: high, Harness: Arena Vision, style control Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena Vision, style controlClaude Opus 4.6: Arena rating from 15,929 published pairwise votes.Mistral Medium 3.5: Arena rating from 3,904 published pairwise votes.	Higher measured value1,313.477 95% confidence interval: ±6.575The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,215.105 95% confidence interval: ±10.552The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
Key to the marks:better valuebetter, but not conclusivetie

Claude Opus 4.6 vs. Mistral Medium 3.5

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Claude Opus 4.6

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