AnthropicDeepSeekLLM matchup

Claude Opus 4.5vs.DeepSeek-V4.1-Flash

Which one is better?

DeepSeek-V4.1-Flash performs better than Claude Opus 4.5 and is cheaper: Claude Opus 4.5 costs 33.3 times (input) and 41.7 times (output) as much.

DeepSeek-V4.1-Flash ahead

IntelligenceOverall index, 100 points = average

73.3

Claude Opus 4.5

Rank 59

99.7

DeepSeek-V4.1-Flash

Rank 29

DeepSeek-V4.1-Flash faster

SpeedTokens per second

Claude Opus 4.5

176

DeepSeek-V4.1-Flash

DeepSeek-V4.1-Flash cheaper

Price$ per 1M tokens

$10

Claude Opus 4.5

$0.26

DeepSeek-V4.1-Flash

DeepSeek-V4.1-Flash more popular

Popularity0 to 100

Claude Opus 4.5

Rank 516 of 875

DeepSeek-V4.1-Flash

Rank 298 of 875

Choose Claude Opus 4.5 for

No clear advantage

Choose DeepSeek-V4.1-Flash for

AgentsCodingProductivityLegalFinanceMultimodalHealthMathematics

Where is the difference?

Strengths at a glance

Opus 4.5DeepSeek-V4.1-Flash

The median of all ranked models is below 100 in every area, so it sits in the centre of the net.

CodingDeepSeek-V4.1-Flash ahead

Opus 4.570.5no rank

DeepSeek-V4.1-Flash98.8Rank 30

Median of ranked models83.7

95 % range: Opus 4.5 62.2 to 78.8, DeepSeek-V4.1-Flash 91.4 to 106.3.

AreaOpus 4.5DeepSeek-V4.1-Flash

The same values and verdicts as the bars below. In the top field the net starts at 100 points, the reference group average; values below sit as a hollow point in the centre. Not in the net because a model has no own value there or the data are too thin: Reasoning, Knowledge, General.

DeepSeek-V4.1-Flash is ahead in 7 of 10 areas, Opus 4.5 in none.

too little data: 3DeepSeek-V4.1-Flash ahead: 7

Areas in the overall index

AgentsDeepSeek-V4.1-Flash +3670.0 to 106.4

CodingDeepSeek-V4.1-Flash +2870.5 to 98.8

MultimodalDeepSeek-V4.1-Flash +2273.3 to 95.7

MathematicsDeepSeek-V4.1-Flash +1780.5 to 97.3

Reasoningonly Opus 4.5 has a score

Knowledgeonly Opus 4.5 has a score

Generalonly DeepSeek-V4.1-Flash has a score

Specialist fields

LegalDeepSeek-V4.1-Flash +2674.6 to 100.8

FinanceDeepSeek-V4.1-Flash +2677.7 to 103.7

HealthDeepSeek-V4.1-Flash +1877.3 to 95.5

Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.

Show 3 more areas that do not count toward the overall index

ProductivityDeepSeek-V4.1-Flash +2673.5 to 99.7

Cybersecurityonly DeepSeek-V4.1-Flash has a score

Educationonly DeepSeek-V4.1-Flash has a score

Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.

Which model for which task?

Everyday tasks, translated from the area values above. Each row names the values it rests on.

TaskBetter choicebased on

Writing and debugging codeDeepSeek-V4.1-FlashCoding 70.5 to 98.8

Maths and data analysisDeepSeek-V4.1-FlashMathematics 80.5 to 97.3, Reasoning without a score for DeepSeek-V4.1-Flash

Facts and researchopenKnowledge without a score for DeepSeek-V4.1-Flash

Agents and workflowsDeepSeek-V4.1-FlashAgents 70.0 to 106.4

Fast chat repliesDeepSeek-V4.1-Flash64 to 176 tokens per second

Security analysisopenCybersecurity without a score for Opus 4.5

Many requests on a small budgetDeepSeek-V4.1-Flash$10 to $0.26 per 1M tokens

Finance, legal and medical textsDeepSeek-V4.1-FlashFinance 77.7 to 103.7, Legal 74.6 to 100.8, Health 77.3 to 95.5

Images, screenshots and PDFsDeepSeek-V4.1-FlashMultimodal 73.3 to 95.7

See for yourself: same task, one attempt

The same prompt for both models. We show the latest attempt without fixes; it does not count toward the overall index.

Pelican on a bicycle

Prompt

Generate an SVG of a pelican riding a bicycle

Task origin: Simon Willison

Claude Opus 4.5

Oct 1, 2026 · 22 s · $0.05

Test details

Run date: Oct 1, 2026
API provider: openrouter
Requested API model: anthropic/claude-opus-4.5
Reasoning setting: high
Token limit including reasoning: 8,192 tokens
Output tokens: 1,810 tokens
Cost of the attempt: $0.0455
Response time: 21.6 s
API model reported in response: anthropic/claude-opus-4.5
Pinned endpoint: Anthropic | anthropic/claude-4.5-opus-20251124
Temperature: Provider default
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating

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

DeepSeek-V4.1-Flash

The response reached the token limit. No complete recording is available.

Oct 5, 2026 · 26 s · $0.0049

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

Test details

Run date: Oct 5, 2026
API provider: openrouter
Requested API model: deepseek/deepseek-v4.1-flash
Reasoning setting: high
Token limit including reasoning: 8,192 tokens
Output tokens: 8,191 tokens
Cost of the attempt: $0.0049
Response time: 25.8 s
API model reported in response: deepseek/deepseek-v4.1-flash
Pinned endpoint: DeepSeek | deepseek/deepseek-v4.1-flash-20260910
Temperature: Provider default
Test protocol: community-visual-tests-v1
Technical checks: Failed

Earlier attempts (2)

Oct 2, 2026API request failedReasoning setting: high
Oct 1, 2026API request failedReasoning setting: high

SVG short test

One SVG task with the same fixed settings for every model, without hidden thinking.

Prompt

Return only one standalone SVG of a pelican riding a bicycle. Use viewBox="0 0 800 600", simple shapes, two clearly visible wheels and a recognizable pelican with a long beak. At most 30 SVG elements and 1800 characters. No Markdown, explanations, comments, scripts, animation, CSS or external resources.

Claude Opus 4.5

Unavailable in this round

DeepSeek-V4.1-Flash

Claude Opus 4.5 and DeepSeek-V4.1-Flash in the overall index

Every model with a place in the overall index, both models of this matchup highlighted. You can add or hide other models.

Overall index (Gradually Meta-Score v4)

20 of 91 models

4 models in this view are measured at a lower reasoning effort than max in the overall index. Dashed column: lower reasoning effort than the top.

Claude Opus 5.5max126.1

Gemini 4 Carbonhigh125.7

Claude Fable 5.1max123.8

Claude Sonnet 5.5max122.8

Gemini 4 Argonhigh122.3

GPT-6 Astramax121.3

GPT-6.1 Solmax119.2

Muse Wonder Fullmax118.3

Claude Opus 5max117.2

Muse Wondermax113.4

Kimi K3.1 Promax112.9

Claude Fable 5max112.5

GPT-6 Solmax110.6

GPT-5.6 Solmax108.7

Muse Spark 1.3max107.4

Gemini 3.7 Flashhigh107.1

DeepSeek V4.1 Flash 1017max106.6

Gemini 3.8 Flashhigh106.5

DeepSeek-V4.1-Flashmax99.7

Claude Opus 4.573.3

Claude Opus 5.5

Gemini 4 Carbon

Claude Fable 5.1

Claude Sonnet 5.5

Gemini 4 Argon

GPT-6 Astra

GPT-6.1 Sol

Muse Wonder Full

Claude Opus 5

Muse Wonder

Kimi K3.1 Pro

Claude Fable 5

GPT-6 Sol

GPT-5.6 Sol

Muse Spark 1.3

Gemini 3.7 Flash

DeepSeek V4.1 Flash 1017

Gemini 3.8 Flash

DeepSeek-V4.1-Flash

Claude Opus 4.5

Popularity compared

How often the models are searched for, used and mentioned, on a scale from 0 to 100.

DeepSeek-V4.1-Flash is more popular than Claude Opus 4.5: 38 to 26 out of 100.

Over time

Weekly values from October 18, 2026 to November 5, 2026

Claude Opus 4.5DeepSeek-V4.1-Flash

All data side by side

The better value is bold. For the overall index only when the gap is clear.

Metric	Claude Opus 4.5	DeepSeek-V4.1-Flash
Intelligence
Overall indexpoints, 100 = reference group average, higher is better	73.3	99.7
Rank	Rank 59 of 91	Rank 29 of 91
Price per 1M tokens
Inputwhat you send	$5	$0.15
Outputwhat the model writes	$25	$0.60
Cost per task (own tests)average of 2 tests both passed	$0.25	$0.008
Speed
Tokens per second	64	176
Popularity
Popularitysearch, usage and mentions, 0 to 100	26Rank 516 of 875	38Rank 298 of 875
Technical
Context windowhow much text the model reads at once	200,000 tokens≈ 300 A4 pages	1 M tokens≈ 1,500 A4 pages
Knowledge cutoff	May 2025	n/a
Released	November 2025	Sep 10, 2026
Availability	Active	Active
Open weights	no	yes

DeepSeek-V4.1-Flash: At peak times (Mon, Tue, Wed, Thu, Fri, 01:00-04:00 UTC; Mon, Tue, Wed, Thu, Fri, 06:00-10:00 UTC) the price is $0.30 input and $1.20 output per 1M tokens. The table shows the off-peak price.

Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis

Is there a better choice?

Successor of Opus 4.5Claude Opus 4.6

Overall index 81.9, rank 52. $5 input and $25 output per 1M tokens.

DeepSeek-V4.1-Flash vs. Claude Opus 4.6

Successor of DeepSeek-V4.1-FlashDeepSeek V4.1 Flash 1017

Overall index 106.6, rank 17. $0.15 input and $0.60 output per 1M tokens.

Opus 4.5 vs. DeepSeek V4.1 Flash 1017

Cheaper than DeepSeek-V4.1-FlashClaude Haiku 5.5

Overall index 103.4, rank 20. $0.10 input and $0.50 output per 1M tokens.

DeepSeek-V4.1-Flash vs. Claude Haiku 5.5

Shared benchmarks

Single results from the same benchmark version, task and metric. A value is bold only with the same test setup and a clear gap.

A: Claude Opus 4.5B: DeepSeek-V4.1-Flash

LegalBenchOverall · higher is betterTest setup not documented as identical82.8%83.3%Vals AIAs of 10/13/2026

MedCodeOverall · higher is betterTest setup not documented as identical45.2%41.2%Vals AIAs of 10/29/2026

MedScribeOverall · higher is betterTest setup not documented as identical83.2%85.5%Vals AIAs of 10/29/2026

MMMU-ProOverall · higher is better71.2%65.6%Artificial AnalysisAs of 11/06/2026

LegalBenchConclusion Tasks · higher is betterTest setup not documented as identical87.7%89.1%Vals AIAs of 10/13/2026

LegalBenchInterpretation Tasks · higher is betterTest setup not documented as identical82.2%80.4%Vals AIAs of 10/13/2026

LegalBenchIssue Tasks · higher is betterTest setup not documented as identical84.2%88.8%Vals AIAs of 10/13/2026

LegalBenchRhetoric Tasks · higher is betterTest setup not documented as identical79.8%80.1%Vals AIAs of 10/13/2026

LegalBenchRule Tasks · higher is betterTest setup not documented as identical80.3%78%Vals AIAs of 10/13/2026

More comparisons

Compare Claude Opus 4.5 and DeepSeek-V4.1-Flash with the models people compare them with most often.

Claude Opus 4.5vs.DeepSeek-V4.1-Flash

Choose Claude Opus 4.5 for

Choose DeepSeek-V4.1-Flash for

Where is the difference?

Strengths at a glance

Which model for which task?

See for yourself: same task, one attempt

Pelican on a bicycle

SVG short test

Claude Opus 4.5

DeepSeek-V4.1-Flash

Claude Opus 4.5 and DeepSeek-V4.1-Flash in the overall index

Overall index (Gradually Meta-Score v4)

Popularity compared

Over time

All data side by side

Is there a better choice?

Shared benchmarks

More comparisons

Compare another matchup

Predecessor and successor

The most popular comparisons