OpenAIDeepSeekLLM matchup

GPT-5.6 Terravs.DeepSeek-V4.1-Flash

Which one is better?

GPT-5.6 Terra and DeepSeek-V4.1-Flash perform about equally well, but GPT-5.6 Terra costs 13.3 times (input) and 20 times (output) as much.

level

IntelligenceOverall index, 100 points = average

100.7

GPT-5.6 Terra

Rank 26

99.7

DeepSeek-V4.1-Flash

Rank 29

DeepSeek-V4.1-Flash faster

SpeedTokens per second

100

GPT-5.6 Terra

176

DeepSeek-V4.1-Flash

DeepSeek-V4.1-Flash cheaper

Price$ per 1M tokens

$4.50

GPT-5.6 Terra

$0.26

DeepSeek-V4.1-Flash

GPT-5.6 Terra more popular

Popularity0 to 100

GPT-5.6 Terra

Rank 24 of 876

DeepSeek-V4.1-Flash

Rank 312 of 876

Above 272,000 tokens of context, GPT-5.6 Terra costs more: $4 input and $18 output per 1M tokens.

Choose GPT-5.6 Terra for

MathematicsEducationMultimodalGeneral (not certain)Coding (not certain)

Choose DeepSeek-V4.1-Flash for

Agents (not certain)

Where is the difference?

Strengths at a glance

GPT-5.6 TerraDeepSeek-V4.1-FlashMedian of all ranked models

CodingGPT-5.6 Terra slightly ahead

GPT-5.6 Terra104.0Rank 21

DeepSeek-V4.1-Flash98.8Rank 30

Median of ranked models84.1

95 % range: GPT-5.6 Terra 98.6 to 109.3, DeepSeek-V4.1-Flash 91.4 to 106.3.

AreaGPT-5.6 TerraDeepSeek-V4.1-Flash

The same values and verdicts as the bars below. In the close-up the net starts at 90 points, just below the weaker model's lowest value; the reference group average is 100. Not in the net because a model has no own value there or the data are too thin: Reasoning, Knowledge.

GPT-5.6 Terra is ahead in 2 of 10 areas, DeepSeek-V4.1-Flash in none.

GPT-5.6 Terra ahead: 2GPT-5.6 Terra slightly ahead: 2level: 3too little data: 2DeepSeek-V4.1-Flash slightly ahead: 1

Areas in the overall index

MathematicsGPT-5.6 Terra +4101.7 to 97.3

MultimodalGPT-5.6 Terra +499.4 to 95.7

Generalleaning GPT-5.6 Terranot certain · 4 tests each

Agentsleaning DeepSeek-V4.1-Flashnot certain · 6 and 4 tests

Codingleaning GPT-5.6 Terranot certain · 12 and 11 tests

Reasoningonly GPT-5.6 Terra has a score

Knowledgeonly GPT-5.6 Terra has a score

Specialist fields

Financelevel101.7 to 103.7

Healthlevel96.6 to 95.5

Legallevel101.6 to 100.8

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

EducationGPT-5.6 Terra +4102.0 to 97.9

Cybersecuritytoo little data104.2 to 103.2

Productivitytoo little data98.8 to 99.7

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.

GPT-5.6 Terra vs. DeepSeek-V4.1-Flash at the same effort

Both models measured at the same reasoning efforts. This shows whether a lead comes from the model or only from more compute.

maxtied

GPT-5.6 Terra 100.7 vs. DeepSeek-V4.1-Flash 99.7 · Gap 2.8 · Test series 3

Overall index (max vs. max)level

GPT-5.6 Terra 100.7 vs. DeepSeek-V4.1-Flash 99.7

Effort	GPT-5.6 Terra	DeepSeek-V4.1-Flash	Gap	Verdict	Test series
max	100.7	99.7	2.8	tied	3
Overall index (max vs. max)	100.7	99.7	1.0	level

Gap and verdict compare only the Artificial Analysis test series in which both models are measured at that effort. Tied below 3 points, ahead only beyond two standard errors. The single values rest on all test series of each model, so their difference can deviate from the gap.

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 codeleaning GPT-5.6 TerraCoding 104.0 to 98.8

Maths and data analysisGPT-5.6 TerraMathematics 101.7 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 workflowsleaning DeepSeek-V4.1-FlashAgents 100.9 to 106.4

Fast chat repliesDeepSeek-V4.1-Flash100 to 176 tokens per second

Security analysisopenCybersecurity 104.2 to 103.2 (too little data)

Many requests on a small budgetDeepSeek-V4.1-Flash$4.50 to $0.26 per 1M tokens

Finance, legal and medical textslevelFinance 101.7 to 103.7, Legal 101.6 to 100.8, Health 96.6 to 95.5

Images, screenshots and PDFsGPT-5.6 TerraMultimodal 99.4 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

GPT-5.6 Terra

Sep 7, 2026 · 65 s · $0.04

Test details

Run date: Sep 7, 2026
API provider: openrouter
Requested API model: openai/gpt-5.6-terra
Reasoning setting: high
Token limit including reasoning: 8,192 tokens
Output tokens: 3,373 tokens
Cost of the attempt: $0.0405
Response time: 64.6 s
API model reported in response: openai/gpt-5.6-terra
Pinned endpoint: OpenAI | openai/gpt-5.6-terra-20260709
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.

GPT-5.6 Terra

Unavailable in this round

DeepSeek-V4.1-Flash

GPT-5.6 Terra 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 92 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 Carbonhigh125.8

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 Solmax110.5

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

GPT-5.6 Terramax100.7

DeepSeek-V4.1-Flashmax99.7

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

GPT-5.6 Terra

DeepSeek-V4.1-Flash

Popularity compared

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

GPT-5.6 Terra is more popular than DeepSeek-V4.1-Flash: 64 to 38 out of 100.

Over time

Weekly values from October 18, 2026 to November 6, 2026

GPT-5.6 TerraDeepSeek-V4.1-Flash

All data side by side

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

Metric	GPT-5.6 Terra	DeepSeek-V4.1-Flash
Intelligence
Overall indexpoints, 100 = reference group average, higher is better	100.7	99.7
Rank	Rank 26 of 92	Rank 29 of 92
Price per 1M tokens
Inputwhat you send	$2above 272,000 tokens: $4	$0.15
Outputwhat the model writes	$12above 272,000 tokens: $18	$0.60
Cost per task (own tests)average of 2 original-protocol tasks both models passed (SVG short test not included)	$0.05	$0.008
Speed
Tokens per second	100	176
Popularity
Popularitysearch, usage and mentions, 0 to 100	64Rank 24 of 876	38Rank 312 of 876
Technical
Context windowhow much text the model reads at once	1.05 M tokens≈ 1,580 A4 pages	1 M tokens≈ 1,500 A4 pages
Knowledge cutoff	Feb 16, 2026	n/a
Released	Jul 9, 2026	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 GPT-5.6 TerraGPT-6.1 Terra

Overall index 105.3, rank 19$1 input and $5 output per 1M tokens

DeepSeek-V4.1-Flash vs. GPT-6.1 Terra

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

GPT-5.6 Terra 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

GPT-5.6 Terra 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: GPT-5.6 TerraB: DeepSeek-V4.1-Flash

Code MigrationOverall · higher is betterTest setup not documented as identical47.8%45.6%Vals AIAs of 10/29/2026

CyberBench v1.1Overall · higher is betterTest setup not documented as identical72.1%73.7%Vals AIAs of 11/05/2026

EMBOverall · higher is betterTest setup not documented as identical66.2%57.2%Vals AIAs of 10/20/2026

Finance Agent (v2)Overall · higher is betterTest setup not documented as identical54.4%53.5%Vals AIAs of 10/29/2026

GDPval-AAOverall · higher is better1,461.5 elo1,600.0 eloArtificial AnalysisAs of 11/06/2026

IOIOverall · higher is betterTest setup not documented as identical87.6%40.3%Vals AIAs of 10/29/2026

ITBench-AA (SRE)Overall · higher is better51.0%46.9%Artificial AnalysisAs of 11/06/2026

Legal Research BenchOverall · All-pass · higher is betterTest setup not documented as identical41.3%41.3%Vals AIAs of 11/05/2026

LegalBenchOverall · higher is betterTest setup not documented as identical85.1%83.3%Vals AIAs of 10/13/2026

LMArena Text, Style ControlOverall · higher is betterTest setup not documented as identical1,4671,476LMArenaAs of 10/28/2026

Show 54 more benchmarks

LMArena Vision, Style ControlOverall · higher is betterTest setup not documented as identical1,2681,261LMArenaAs of 10/19/2026

MedCodeOverall · higher is betterTest setup not documented as identical43.4%41.2%Vals AIAs of 10/29/2026

MedScribeOverall · higher is betterTest setup not documented as identical82.9%85.5%Vals AIAs of 10/29/2026

MMMU-ProOverall · higher is better80.7%77.0%Artificial AnalysisAs of 11/06/2026

ProgramBenchOverall · higher is betterTest setup not documented as identical0.5%0.5%Vals AIAs of 11/05/2026

ProofBench v1.1Overall · higher is betterTest setup not documented as identical74%54%Vals AIAs of 10/29/2026

Public Benefits Bench v1.1Overall · higher is betterTest setup not documented as identical62.4%64.3%Vals AIAs of 10/12/2026

SAGEOverall · higher is betterTest setup not documented as identical87.0%85.4%Vals AIAs of 11/05/2026

SkillsBenchOverall · higher is betterTest setup not documented as identical58.9%69.8%Vals AIAs of 10/29/2026

SRE BenchOverall · higher is betterTest setup not documented as identical9.5%0.8%Vals AIAs of 11/05/2026

Tax Agent BenchOverall · higher is betterTest setup not documented as identical30.0%26.6%Vals AIAs of 11/05/2026

Terminal-Bench 4.0Overall · higher is betterTest setup not documented as identical22.7%19.7%Vals AIAs of 11/05/2026

Terminal-Bench-ScienceOverall · higher is betterTest setup not documented as identical10%0%Vals AIAs of 11/05/2026

Vibe Code Bench 1-100Overall · higher is betterTest setup not documented as identical14.8%16.4%Vals AIAs of 10/29/2026

Vibe Code Bench v1.1Overall · higher is betterTest setup not documented as identical74.6%84.7%Vals AIAs of 11/05/2026

Code MigrationCLI · higher is betterTest setup not documented as identical40.4%37.5%Vals AIAs of 10/29/2026

CyberBench v1.1Patch · higher is betterTest setup not documented as identical87.5%85.7%Vals AIAs of 11/05/2026

EMBComps · higher is betterTest setup not documented as identical62.2%43.9%Vals AIAs of 10/20/2026

Finance Agent (v2)Adjustments · higher is betterTest setup not documented as identical49.7%49.2%Vals AIAs of 10/29/2026

IOIIOI 2024 · higher is betterTest setup not documented as identical85.0%42.7%Vals AIAs of 10/29/2026

Legal Research BenchAdministrative / Regulatory · All-pass · higher is betterTest setup not documented as identical57.6%53.0%Vals AIAs of 11/05/2026

LegalBenchConclusion Tasks · higher is betterTest setup not documented as identical90.3%89.1%Vals AIAs of 10/13/2026

LMArena Text, Style ControlBusiness, management and finance · higher is betterTest setup not documented as identical1,4661,478LMArenaAs of 10/28/2026

LMArena Vision, Style ControlChinese · higher is betterTest setup not documented as identical1,3131,311LMArenaAs of 10/19/2026

ProgramBenchAlmost Resolved · higher is betterTest setup not documented as identical15.0%16.5%Vals AIAs of 11/05/2026

SAGEComputer Science · higher is betterTest setup not documented as identical89.2%91.1%Vals AIAs of 11/05/2026

SkillsBenchNo Skills · higher is betterTest setup not documented as identical48.8%61.7%Vals AIAs of 10/29/2026

SRE BenchCapability Score · higher is betterTest setup not documented as identical26.8%14.2%Vals AIAs of 11/05/2026

Tax Agent BenchControversy & Precedence Analysis · higher is betterTest setup not documented as identical16.7%3.3%Vals AIAs of 11/05/2026

Terminal-Bench 4.0Hardware · higher is betterTest setup not documented as identical0%0%Vals AIAs of 11/05/2026

Terminal-Bench-ScienceEarth Sciences · higher is betterTest setup not documented as identical0%0%Vals AIAs of 11/05/2026

Code MigrationCOBOL · higher is betterTest setup not documented as identical70%70%Vals AIAs of 10/29/2026

CyberBench v1.1PoC · higher is betterTest setup not documented as identical56.7%61.7%Vals AIAs of 11/05/2026

EMBDataroom · higher is betterTest setup not documented as identical82.2%73.9%Vals AIAs of 10/20/2026

Finance Agent (v2)All-Pass · higher is betterTest setup not documented as identical42.8%41.1%Vals AIAs of 10/29/2026

IOIIOI 2025 · higher is betterTest setup not documented as identical77.8%35.2%Vals AIAs of 10/29/2026

Legal Research BenchAdministrative / Regulatory · Weighted partial credit (weighted pass) · higher is betterTest setup not documented as identical88.8%89.1%Vals AIAs of 11/05/2026

LegalBenchInterpretation Tasks · higher is betterTest setup not documented as identical83.2%80.4%Vals AIAs of 10/13/2026

LMArena Text, Style ControlChinese · higher is betterTest setup not documented as identical1,5161,523LMArenaAs of 10/28/2026

LMArena Vision, Style ControlCreative writing with images · higher is betterTest setup not documented as identical1,2541,254LMArenaAs of 10/19/2026

ProgramBenchFully Resolved · higher is betterTest setup not documented as identical0.5%0.5%Vals AIAs of 11/05/2026

SAGELinear Algebra · higher is betterTest setup not documented as identical79.5%72.7%Vals AIAs of 11/05/2026

SkillsBenchWith Skills · higher is betterTest setup not documented as identical58.9%69.8%Vals AIAs of 10/29/2026

SRE BenchFully Solved · higher is betterTest setup not documented as identical9.5%0.8%Vals AIAs of 11/05/2026

Tax Agent BenchControversy & Precedence Analysis (weighted pass) · higher is betterTest setup not documented as identical64.8%52.8%Vals AIAs of 11/05/2026

Terminal-Bench 4.0Media · higher is betterTest setup not documented as identical16.7%8.3%Vals AIAs of 11/05/2026

Terminal-Bench-ScienceEngineering Sciences · higher is betterTest setup not documented as identical0%0%Vals AIAs of 11/05/2026

Code MigrationCode Quality · higher is betterTest setup not documented as identical3.948 / 54.411 / 5Vals AIAs of 10/29/2026

EMBDCF · higher is betterTest setup not documented as identical53.4%51.0%Vals AIAs of 10/20/2026

Finance Agent (v2)Comparables · higher is betterTest setup not documented as identical47.0%46.1%Vals AIAs of 10/29/2026

IOIIOI 2026 · higher is betterTest setup not documented as identical100%43%Vals AIAs of 10/29/2026

Legal Research BenchBusiness & Commercial · All-pass · higher is betterTest setup not documented as identical37.2%39.5%Vals AIAs of 11/05/2026

LegalBenchIssue Tasks · higher is betterTest setup not documented as identical89.4%88.8%Vals AIAs of 10/13/2026

LMArena Text, Style ControlCoding · higher is betterTest setup not documented as identical1,5171,523LMArenaAs of 10/28/2026

More comparisons

Compare GPT-5.6 Terra and DeepSeek-V4.1-Flash with the models people compare them with most often.

GPT-5.6 Terravs.DeepSeek-V4.1-Flash

Choose GPT-5.6 Terra for

Choose DeepSeek-V4.1-Flash for

Where is the difference?

Strengths at a glance

GPT-5.6 Terra vs. DeepSeek-V4.1-Flash at the same effort

Which model for which task?

See for yourself: same task, one attempt

Pelican on a bicycle

SVG short test

GPT-5.6 Terra

DeepSeek-V4.1-Flash

GPT-5.6 Terra 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