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Claude Opus 5 vs GPT-5.1

Updated October 21, 2026. 80 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5 Replace GPT-5.1
Claude Opus 5Anthropic
Coding
81.8
Overall
50.8
Output $/M
$25.00
80
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
0
vs boards won of 80 shared

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 53.3 for GPT-5.1.

Pick GPT-5.1 when output tokens cost 2.5x less, or when a solved task costs $1.02 against $1.33.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved task
Shared results
80
Claude Opus 5 only
50
GPT-5.1 only
20
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 5 81.8 from 2 benchmarks, GPT-5.1 53.3 from 2 benchmarks.
Widest category
Agentic work, 60.7 points apart on average over 1 shared benchmark.
Widest single gap
ARC-AGI-2: Claude Opus 5 90.4% against GPT-5.1 17.6%, 72.8 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against GPT-5.1 $10.00 per million output tokens, 2.5x apart.
Context window
Claude Opus 5 takes 1M tokens, GPT-5.1 400K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 5BarsGPT-5.1Ties
Coding110
Intelligence20
Agentic work10
Reasoning150
Math30
Knowledge110
Web design80
General290
All shared boards800
CodingLike-for-likeFour of these boards feed the Vibe Coding Index110
Coding benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
SWE-bench VerifiedNot measured66.0%Only GPT-5.1 measured
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891396Claude Opus 5
AA Coding Index78.049.4Claude Opus 5
LiveCodeBench (Vals AI)89.0%86.5%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%69.8%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%24.6%Claude Opus 5
Code migration (Vals AI)57.5%Not measuredOnly Claude Opus 5 measured
ProgramBench (Vals AI)3.0%Not measuredOnly Claude Opus 5 measured
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%Not measuredOnly Claude Opus 5 measured
LiveCodeBench (Artificial Analysis run)Not measured86.8%Only GPT-5.1 measured
SciCode56.4%Not measuredOnly Claude Opus 5 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured45.5%Only GPT-5.1 measured
Terminal-BenchNot measured47.6%Only GPT-5.1 measured
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
GSO-BenchNot measured13.7%Only GPT-5.1 measured
WeirdML91.8%60.8%Claude Opus 5
ALE-Bench2164.6Not measuredOnly Claude Opus 5 measured
LMArena Text: coding15331453Claude Opus 5
LMArena Text: software and IT15271454Claude Opus 5
LMArena WebDev: React17111307Claude Opus 5
LMArena WebDev: HTML16801405Claude Opus 5
LMArena WebDev: from an image16621421Claude Opus 5
Neither model has a result on the other 9 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
AA Intelligence Index50.824.7Claude Opus 5
Epoch Capabilities Index163.9149.8Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
AA Agentic Index56.5Not measuredOnly Claude Opus 5 measured
Design Arena: agents building web apps1266Not measuredOnly Claude Opus 5 measured
Design Arena: agents building full-stack apps1306Not measuredOnly Claude Opus 5 measured
Design Arena: agents building mobile apps1348Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Android apps1258Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games1261Not measuredOnly Claude Opus 5 measured
Design Arena: PowerPoint slides1265Not measuredOnly Claude Opus 5 measured
LiveBench research88.9%Not measuredOnly Claude Opus 5 measured
LiveBench browser84.0%Not measuredOnly Claude Opus 5 measured
LiveBench long agentic62.1%Not measuredOnly Claude Opus 5 measured
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%Not measuredOnly Claude Opus 5 measured
Tax Agent Bench (Vals AI)45.5%Not measuredOnly Claude Opus 5 measured
Legal Research Bench (Vals AI)55.3%Not measuredOnly Claude Opus 5 measured
Excel Modeling Benchmark (Vals AI)73.6%Not measuredOnly Claude Opus 5 measured
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%Not measuredOnly Claude Opus 5 measured
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
τ²-Bench TelecomNot measured81.9%Only GPT-5.1 measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
DeepResearch BenchNot measured42.8%Only GPT-5.1 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182$1,473Claude Opus 5
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index150
Reasoning benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
GPQA Diamond93.4%86.6%Claude Opus 5
LiveBench reasoning91.2%Not measuredOnly Claude Opus 5 measured
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%83.2%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%87.3%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%28.5%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%87.6%Claude Opus 5
ARC-AGI97.5%72.8%Claude Opus 5
ARC-AGI-290.4%17.6%Claude Opus 5
SimpleBench80.6%53.2%Claude Opus 5
Chess puzzles43.0%42.0%Claude Opus 5
Mystery game puzzles59.0%19.0%Claude Opus 5
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
VPCTNot measured58.7%Only GPT-5.1 measured
LMArena Text: hard prompts15271457Claude Opus 5
LMArena Text: expert15541470Claude Opus 5
LMArena Text: hard prompts in English15231462Claude Opus 5
LMArena Vision: diagrams13481264Claude Opus 5
LMArena Vision: homework13381272Claude Opus 5
Neither model has a result on the other 2 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
AIMENot measured93.3%Only GPT-5.1 measured
MGSM (Vals AI)Not measured93.0%Only GPT-5.1 measured
AA Math IndexNot measured94.0Only GPT-5.1 measured
AIME 2025 (Artificial Analysis run)Not measured94.0%Only GPT-5.1 measured
OTIS Mock AIME98.9%88.6%Claude Opus 5
FrontierMath, tiers 1 to 385.6%Not measuredOnly Claude Opus 5 measured
FrontierMath, tier 473.2%Not measuredOnly Claude Opus 5 measured
ProofBench99.0%Not measuredOnly Claude Opus 5 measured
LMArena Text: math15331446Claude Opus 5
LMArena Text: mathematical work15441449Claude Opus 5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
MMLU Pro91.6%86.4%Claude Opus 5
LegalBench (Vals AI)87.0%85.7%Claude Opus 5
CaseLaw (Vals AI)Not measured73.4%Only GPT-5.1 measured
CorpFin (Vals AI)73.2%63.8%Claude Opus 5
TaxEval (Vals AI)75.1%74.9%Claude Opus 5
MortgageTax (Vals AI)72.1%61.4%Claude Opus 5
MedQA (Vals AI)Not measured96.4%Only GPT-5.1 measured
MedCode (Vals AI)63.6%52.7%Claude Opus 5
MMLU Pro (Artificial Analysis run)Not measured87.0%Only GPT-5.1 measured
SimpleQA Verified59.9%48.0%Claude Opus 5
LMArena Text: science15311459Claude Opus 5
LMArena Text: medicine and healthcare15251456Claude Opus 5
LMArena Text: legal and government15301459Claude Opus 5
LMArena Text: business and finance15011431Claude Opus 5
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
Design Arena: websites13091187Claude Opus 5
Design Arena: UI components13481166Claude Opus 5
Design Arena: game dev13391179Claude Opus 5
Design Arena: data viz13291204Claude Opus 5
Design Arena: 3D13351061Claude Opus 5
Design Arena: all code categories13241171Claude Opus 5
Design Arena: SVG13101149Claude Opus 5
Design Arena: ASCII art13521118Claude Opus 5
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index290
General benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
LiveBench data analysis74.6%Not measuredOnly Claude Opus 5 measured
Public Benefits Bench (Vals AI)76.9%Not measuredOnly Claude Opus 5 measured
SAGE (Vals AI)49.4%43.2%Claude Opus 5
MedScribe (Vals AI)91.0%88.1%Claude Opus 5
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
IFBenchNot measured72.9%Only GPT-5.1 measured
Long context reasoning (AA-LCR)82.0%80.0%Claude Opus 5
DTBench97.9%90.1%Claude Opus 5
LMCA64.5%43.9%Claude Opus 5
CL-benchNot measured23.7%Only GPT-5.1 measured
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
CL-bench LifeNot measured17.3%Only GPT-5.1 measured
LMArena Text15091443Claude Opus 5
LMArena Text: instruction following15181443Claude Opus 5
LMArena Text: creative writing14931427Claude Opus 5
LMArena Vision13201250Claude Opus 5
LMArena Text: English15081451Claude Opus 5
LMArena Text: non-English15021431Claude Opus 5
LMArena Text: Chinese15731495Claude Opus 5
LMArena Text: German15271438Claude Opus 5
LMArena Text: Japanese15201453Claude Opus 5
LMArena Text: Korean15171401Claude Opus 5
LMArena Text: French15191450Claude Opus 5
LMArena Text: Spanish15231433Claude Opus 5
LMArena Text: Russian15071435Claude Opus 5
LMArena Text: Polish15221440Claude Opus 5
LMArena Text: multi-turn15001450Claude Opus 5
LMArena Text: longer queries15171448Claude Opus 5
LMArena Text: writing and language14991428Claude Opus 5
LMArena Text: entertainment and media14811415Claude Opus 5
LMArena Vision: English13151252Claude Opus 5
LMArena Vision: Chinese14001270Claude Opus 5
LMArena Vision: reading text13291255Claude Opus 5
LMArena Vision: humor12931263Claude Opus 5
LMArena Vision: captioningNot measured1252Only GPT-5.1 measured
LMArena Vision: recognizing thingsNot measured1232Only GPT-5.1 measured
LMArena Vision: creative writing13131266Claude Opus 5
LMArena Document15161403Claude Opus 5
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5 and GPT-5.1
BenchmarkClaude Opus 5GPT-5.1Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 5$0.018Fits in one request
GPT-5.1$0.0063Fits in one request

GPT-5.1 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
GPT-5.1$0.092Fits in one request

GPT-5.1 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
GPT-5.1$0.350Fits in one request

GPT-5.1 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 5 and GPT-5.1
SpecificationAnthropic Claude Opus 5OpenAI GPT-5.1
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026November 13, 2025
Context window1M400K
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$10.00
Coding index81.853.3
Independent measurements behind it22
Cost per solved task$1.33$1.02
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than GPT-5.1 for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 53.3 for GPT-5.1. Pick GPT-5.1 when output tokens cost 2.5x less, or when a solved task costs $1.02 against $1.33.

Which is cheaper, Claude Opus 5 or GPT-5.1?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5.1 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and GPT-5.1 $1.02.

Which has the bigger context window, Claude Opus 5 or GPT-5.1?

Claude Opus 5, with 1M tokens against 400K.

How many benchmarks is the Claude Opus 5 vs GPT-5.1 comparison based on?

80 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 2 independent benchmarks and GPT-5.1's on 2. Where only one model has a result, the page says so instead of naming a winner.

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