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Claude Opus 5 vs GPT-5.5

Claude Opus 5 leads GPT-5.5 on coding, 83.0 to 71.3 on the Vibe Coding Index, and Claude Opus 5 costs 1.2x less per output token ($25.00 vs $30.00 per million). Updated October 21, 2026; 118 benchmarks have a result for both.

Replace Claude Opus 5 Replace GPT-5.5
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
112
GPT-5.5OpenAI
Coding
71.3
Overall
69.2
Output $/M
$30.00
6
vs boards won of 118 shared

Claude Opus 5 or GPT-5.5: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 71.3 for GPT-5.5.

Pick GPT-5.5 for a larger context window (1.05M against 1M tokens) and work measured by SkillsBench (Vals AI) or Chess puzzles, where it leads.

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BGPT-5.5OpenAI71.3/1005 independent benchmarks$1.65 per solved task
Shared results
118
Claude Opus 5 only
13
GPT-5.5 only
16
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

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 83.0 from 6 benchmarks, GPT-5.5 71.3 from 5 benchmarks.
Widest category
Agentic work, 17.1 points apart on average over 21 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 5 99.0% against GPT-5.5 50.0%, 49.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against GPT-5.5 $30.00 per million output tokens, 1.2x apart.
Context window
Claude Opus 5 takes 1M tokens, GPT-5.5 1.05M.

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-5.5Ties
Coding181
Intelligence20
Agentic work210
Reasoning161
Math60
Knowledge101
Web design90
General303
All shared boards1126
CodingLike-for-likeSix of these boards feed the Vibe Coding Index181
Coding benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
LiveBench coding90.8%85.1%Claude Opus 5
LMArena WebDev16891513Claude Opus 5
AA Coding Index78.074.9Claude Opus 5
LiveCodeBench (Vals AI)89.0%85.3%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%82.6%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%69.8%Claude Opus 5
Code migration (Vals AI)57.5%45.2%Claude Opus 5
ProgramBench (Vals AI)3.0%0.5%Claude Opus 5
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%76.4%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%62.5%GPT-5.5
CyberBench (Vals AI)65.4%Not measuredOnly Claude Opus 5 measured
SciCode56.4%56.1%Claude Opus 5
Terminal-Bench Hard (Artificial Analysis run)Not measured60.6%Only GPT-5.5 measured
Terminal-BenchNot measured84.7%Only GPT-5.5 measured
FrontierCode53.4%43.0%Claude Opus 5
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
GSO-BenchNot measured40.2%Only GPT-5.5 measured
WeirdML91.8%84.9%Claude Opus 5
MirrorCodeNot measured10.0%Only GPT-5.5 measured
ALE-Bench2164.61943.0Claude Opus 5
LMArena Text: coding15331494Claude Opus 5
LMArena Text: software and IT15271493Claude Opus 5
LMArena WebDev: React17111506Claude Opus 5
LMArena WebDev: HTML16801543Claude Opus 5
LMArena WebDev: from an image16621532Claude Opus 5
SciCode13.8%Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
AA Intelligence Index50.838.4Claude Opus 5
Epoch Capabilities Index163.9159.7Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index210
Agentic work benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
AA Agentic Index56.536.4Claude Opus 5
Design Arena: agents building web apps12661117Claude Opus 5
Design Arena: agents building full-stack apps13061089Claude Opus 5
Design Arena: agents building mobile apps13481143Claude Opus 5
Design Arena: agents building Android apps12541163Claude Opus 5
Design Arena: agents building Godot games12791173Claude Opus 5
Design Arena: agents building games12611179Claude Opus 5
Design Arena: HTML slidesNot measured1067Only GPT-5.5 measured
Design Arena: PowerPoint slides12651109Claude Opus 5
LiveBench research88.9%61.6%Claude Opus 5
LiveBench browser84.0%48.0%Claude Opus 5
LiveBench long agentic62.1%44.6%Claude Opus 5
SREBench (Vals AI)12.2%3.8%Claude Opus 5
Finance Agent (Vals AI)58.6%51.8%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%21.8%Claude Opus 5
Legal Research Bench (Vals AI)55.3%40.4%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%64.5%Claude Opus 5
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%8.3%Claude Opus 5
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
τ²-Bench TelecomNot measured93.9%Only GPT-5.5 measured
APEX-Agents65.8%55.1%Claude Opus 5
Remote Labor IndexNot measured6.3%Only GPT-5.5 measured
OSWorld 2.031.4%13.0%Claude Opus 5
BALROG63.4%Not measuredOnly Claude Opus 5 measured
DeepResearch BenchNot measured54.0%Only GPT-5.5 measured
PostTrainBench35.0%27.2%Claude Opus 5
Vending-Bench 2$11,182$7,524Claude 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 index161
Reasoning benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
GPQA Diamond93.4%93.2%Claude Opus 5
LiveBench reasoning91.2%89.7%Claude Opus 5
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%88.3%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%93.5%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%45.8%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%90.7%Claude Opus 5
ARC-AGI97.5%95.0%Claude Opus 5
ARC-AGI-290.4%85.0%Claude Opus 5
SimpleBench80.6%69.0%Claude Opus 5
Chess puzzles43.0%63.0%GPT-5.5
Mystery game puzzles59.0%56.0%Claude Opus 5
EBR-bench45.7%34.3%Claude Opus 5
LMArena Text: hard prompts15271489Claude Opus 5
LMArena Text: expert15541507Claude Opus 5
LMArena Text: hard prompts in English15231483Claude Opus 5
LMArena Vision: diagrams13481325Claude Opus 5
LMArena Vision: homework13381332Claude Opus 5
Kagi LLM BenchmarkNot measured88.8%Only GPT-5.5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
OTIS Mock AIME98.9%84.4%Claude Opus 5
FrontierMath, tiers 1 to 385.6%85.3%Claude Opus 5
FrontierMath, tier 473.2%72.5%Claude Opus 5
ProofBench99.0%50.0%Claude Opus 5
LMArena Text: math15331487Claude Opus 5
LMArena Text: mathematical work15441496Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
Knowledge benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
MMLU Pro91.6%88.1%Claude Opus 5
LegalBench (Vals AI)87.0%86.5%Claude Opus 5
CaseLaw (Vals AI)Not measured66.2%Only GPT-5.5 measured
CorpFin (Vals AI)73.2%68.4%Claude Opus 5
TaxEval (Vals AI)75.1%75.0%Claude Opus 5
MortgageTax (Vals AI)72.1%68.8%Claude Opus 5
MedCode (Vals AI)63.6%49.1%Claude Opus 5
SimpleQA Verified59.9%63.0%GPT-5.5
LMArena Text: science15311485Claude Opus 5
LMArena Text: medicine and healthcare15251465Claude Opus 5
LMArena Text: legal and government15301491Claude Opus 5
LMArena Text: business and finance15011478Claude Opus 5
FACTS Benchmark SuiteNot measured66.7%Only GPT-5.5 measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
Design Arena: websites13091256Claude Opus 5
Design Arena: UI components13491260Claude Opus 5
Design Arena: game dev13381294Claude Opus 5
Design Arena: data viz13291265Claude Opus 5
Design Arena: 3D13351198Claude Opus 5
Design Arena: all code categories13241260Claude Opus 5
Design Arena: SVG13111234Claude Opus 5
Design Arena: ASCII art13521255Claude Opus 5
LiveBench design83.0%70.3%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index303
General benchmarks for Claude Opus 5 and GPT-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
LiveBench data analysis74.6%81.6%GPT-5.5
Public Benefits Bench (Vals AI)76.9%60.9%Claude Opus 5
SAGE (Vals AI)49.4%51.5%GPT-5.5
MedScribe (Vals AI)91.0%86.9%Claude Opus 5
Vals Multimodal Index73.9%68.1%Claude Opus 5
IFBenchNot measured75.9%Only GPT-5.5 measured
Long context reasoning (AA-LCR)82.0%84.3%GPT-5.5
DTBench97.9%96.0%Claude Opus 5
LMCA64.5%54.3%Claude Opus 5
Surface Evolver BenchNot measured88.1%Only GPT-5.5 measured
Furniture assembly60.8%44.2%Claude Opus 5
ExploitBenchNot measured47.4%Only GPT-5.5 measured
CL-bench LifeNot measured22.2%Only GPT-5.5 measured
LMArena Text15091471Claude Opus 5
LMArena Text: instruction following15181478Claude Opus 5
LMArena Text: creative writing14931455Claude Opus 5
LMArena Vision13201297Claude Opus 5
LMArena Text: English15081470Claude Opus 5
LMArena Text: non-English15021467Claude Opus 5
LMArena Text: Chinese15731534Claude Opus 5
LMArena Text: German15271480Claude Opus 5
LMArena Text: Japanese15201499Claude Opus 5
LMArena Text: Korean15171460Claude Opus 5
LMArena Text: French15191485Claude Opus 5
LMArena Text: Spanish15231468Claude Opus 5
LMArena Text: Russian15071473Claude Opus 5
LMArena Text: Polish15221465Claude Opus 5
LMArena Text: multi-turn15001476Claude Opus 5
LMArena Text: longer queries15171484Claude Opus 5
LMArena Text: writing and language14991466Claude Opus 5
LMArena Text: entertainment and media14811449Claude Opus 5
LMArena Vision: English13151292Claude Opus 5
LMArena Vision: Chinese14001360Claude Opus 5
LMArena Vision: reading text13291306Claude Opus 5
LMArena Vision: humor12931293Claude Opus 5
LMArena Vision: recognizing thingsNot measured1231Only GPT-5.5 measured
LMArena Vision: creative writing13131301Claude Opus 5
LMArena Document15161486Claude 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-5.5
BenchmarkClaude Opus 5GPT-5.5Leader
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-5.5$0.020Fits in one request

Claude Opus 5 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
GPT-5.5$0.340Fits in one request

Claude Opus 5 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
GPT-5.5$1.30Fits in one request

Claude Opus 5 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-5.5
SpecificationAnthropic Claude Opus 5OpenAI GPT-5.5
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026April 24, 2026
Context window1M1.05M
Input $/Mtok$5.00$5.00
Output $/Mtok$25.00$30.00
Coding index83.071.3
Independent measurements behind it65
Cost per solved task$1.33$1.65
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than GPT-5.5 for coding?

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 71.3 for GPT-5.5. Pick GPT-5.5 for a larger context window (1.05M against 1M tokens) and work measured by SkillsBench (Vals AI) or Chess puzzles, where it leads.

Which is cheaper, Claude Opus 5 or GPT-5.5?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5.5 costs $5.00 and $30.00. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and GPT-5.5 $1.65.

Which has the bigger context window, Claude Opus 5 or GPT-5.5?

GPT-5.5, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5 vs GPT-5.5 comparison based on?

118 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 6 independent benchmarks and GPT-5.5's on 5. Where only one model has a result, the page says so instead of naming a winner.

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