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Claude Opus 5 vs GPT-5.6 Sol

Updated October 21, 2026. 129 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-5.6 Sol
Claude Opus 5Anthropic
Coding
81.8
Overall
50.8
Output $/M
$25.00
99
GPT-5.6 SolOpenAI
Coding
76.7
Overall
47.0
Output $/M
$20.00
28
vs boards won of 129 shared, 2 tied

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 76.7 for GPT-5.6 Sol.

Pick GPT-5.6 Sol when output tokens cost 1.3x less, or when a solved task costs $1.20 against $1.33.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BGPT-5.6 SolOpenAI76.7/1002 independent benchmarks$1.20 per solved task
Shared results
129
Claude Opus 5 only
1
GPT-5.6 Sol only
7
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-5.6 Sol 76.7 from 2 benchmarks.
Widest category
Knowledge, 8.2 points apart on average over 11 shared benchmarks.
Widest single gap
LiveBench research: Claude Opus 5 88.9% against GPT-5.6 Sol 54.5%, 34.4 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against GPT-5.6 Sol $20.00 per million output tokens, 1.3x apart.
Context window
Claude Opus 5 takes 1M tokens, GPT-5.6 Sol 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-5.6 SolTies
Coding195
Intelligence20
Agentic work206
Reasoning1251 tie
Math33
Knowledge911 tie
Web design45
General303
All shared boards99282 ties
CodingLike-for-likeFour of these boards feed the Vibe Coding Index195
Coding benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
LiveBench coding90.8%89.7%Claude Opus 5
LMArena WebDev16891616Claude Opus 5
AA Coding Index78.077.4Claude Opus 5
LiveCodeBench (Vals AI)89.0%82.6%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%96.2%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%37.9%Claude Opus 5
Vibe Code Bench (Vals AI)88.4%80.5%Claude Opus 5
Code migration (Vals AI)57.5%52.9%Claude Opus 5
ProgramBench (Vals AI)3.0%1.5%Claude Opus 5
IOI (Vals AI)84.3%91.2%GPT-5.6 Sol
Terminal-Bench 2.1 (Vals AI)84.6%85.8%GPT-5.6 Sol
Vibe Code Bench 1-100 (Vals AI)28.5%20.0%Claude Opus 5
SkillsBench (Vals AI)60.4%54.1%Claude Opus 5
CyberBench (Vals AI)65.4%76.3%GPT-5.6 Sol
SciCode56.4%57.8%GPT-5.6 Sol
Terminal-Bench Hard (Artificial Analysis run)Not measured65.9%Only GPT-5.6 Sol measured
FrontierCode53.4%47.5%Claude Opus 5
FrontierSWE52.0%32.2%Claude Opus 5
GSO-BenchNot measured76.5%Only GPT-5.6 Sol measured
WeirdML91.8%88.8%Claude Opus 5
MirrorCodeNot measured20.0%Only GPT-5.6 Sol measured
ALE-Bench2164.62176.9GPT-5.6 Sol
LMArena Text: coding15331496Claude Opus 5
LMArena Text: software and IT15271489Claude Opus 5
LMArena WebDev: React17111620Claude Opus 5
LMArena WebDev: HTML16801618Claude Opus 5
LMArena WebDev: from an image16621609Claude Opus 5
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
AA Intelligence Index50.847.0Claude Opus 5
Epoch Capabilities Index163.9162.8Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index206
Agentic work benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
AA Agentic Index56.550.2Claude Opus 5
Design Arena: agents building web apps12661245Claude Opus 5
Design Arena: agents building full-stack apps13061261Claude Opus 5
Design Arena: agents building mobile apps13481249Claude Opus 5
Design Arena: agents building Android apps12581246Claude Opus 5
Design Arena: agents building Godot games12791260Claude Opus 5
Design Arena: agents building games12611267GPT-5.6 Sol
Design Arena: HTML slidesNot measured1286Only GPT-5.6 Sol measured
Design Arena: PowerPoint slides12651240Claude Opus 5
LiveBench research88.9%54.5%Claude Opus 5
LiveBench browser84.0%88.0%GPT-5.6 Sol
LiveBench long agentic62.1%48.5%Claude Opus 5
SREBench (Vals AI)12.2%30.5%GPT-5.6 Sol
Finance Agent (Vals AI)58.6%53.8%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%31.1%Claude Opus 5
Legal Research Bench (Vals AI)55.3%48.1%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%72.3%Claude Opus 5
BioMysteryBench (Vals AI)79.3%71.1%Claude Opus 5
Terminal-Bench-Science (Vals AI)27.1%20.0%Claude Opus 5
Vals Science Index47.9%41.5%Claude Opus 5
Time Horizon Index (Vals AI)18.8%23.8%GPT-5.6 Sol
CUA-bench (Vals AI)9.0%8.3%Claude Opus 5
τ²-Bench TelecomNot measured85.1%Only GPT-5.6 Sol measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
OSWorld 2.031.4%27.3%Claude Opus 5
BALROG63.4%60.0%Claude Opus 5
PostTrainBench35.0%36.2%GPT-5.6 Sol
Vending-Bench 2$11,182$9,619Claude Opus 5
LMArena Search12421261GPT-5.6 Sol
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index125
Reasoning benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
GPQA Diamond93.4%95.2%GPT-5.6 Sol
LiveBench reasoning91.2%91.7%GPT-5.6 Sol
MysteryMechanism (Vals AI)37.4%33.3%Claude Opus 5
MMMU Pro (Vals AI)89.9%88.8%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%94.1%GPT-5.6 Sol
Humanity's Last Exam (Artificial Analysis run)54.9%49.5%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%93.5%Claude Opus 5
ARC-AGI97.5%97.5%Tie
ARC-AGI-290.4%92.5%GPT-5.6 Sol
SimpleBench80.6%64.8%Claude Opus 5
Chess puzzles43.0%59.0%GPT-5.6 Sol
Mystery game puzzles59.0%58.0%Claude Opus 5
EBR-bench45.7%44.8%Claude Opus 5
LMArena Text: hard prompts15271483Claude Opus 5
LMArena Text: expert15541517Claude Opus 5
LMArena Text: hard prompts in English15231477Claude Opus 5
LMArena Vision: diagrams13481305Claude Opus 5
LMArena Vision: homework13381305Claude Opus 5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
OTIS Mock AIME98.9%100.0%GPT-5.6 Sol
FrontierMath, tiers 1 to 385.6%89.1%GPT-5.6 Sol
FrontierMath, tier 473.2%82.9%GPT-5.6 Sol
ProofBench99.0%83.0%Claude Opus 5
LMArena Text: math15331473Claude 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 index91
Knowledge benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
MMLU Pro91.6%89.1%Claude Opus 5
LegalBench (Vals AI)87.0%87.0%Tie
CorpFin (Vals AI)73.2%64.4%Claude Opus 5
TaxEval (Vals AI)75.1%74.8%Claude Opus 5
MortgageTax (Vals AI)72.1%67.3%Claude Opus 5
MedCode (Vals AI)63.6%44.0%Claude Opus 5
SimpleQA Verified59.9%69.7%GPT-5.6 Sol
LMArena Text: science15311455Claude Opus 5
LMArena Text: medicine and healthcare15251431Claude Opus 5
LMArena Text: legal and government15301476Claude Opus 5
LMArena Text: business and finance15011457Claude Opus 5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index45
Web design benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
Design Arena: websites13091321GPT-5.6 Sol
Design Arena: UI components13481338Claude Opus 5
Design Arena: game dev13391368GPT-5.6 Sol
Design Arena: data viz13291323Claude Opus 5
Design Arena: 3D13351385GPT-5.6 Sol
Design Arena: all code categories13241341GPT-5.6 Sol
Design Arena: SVG13101316GPT-5.6 Sol
Design Arena: ASCII art13521302Claude Opus 5
LiveBench design83.0%81.6%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index303
General benchmarks for Claude Opus 5 and GPT-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
LiveBench data analysis74.6%79.8%GPT-5.6 Sol
Public Benefits Bench (Vals AI)76.9%66.5%Claude Opus 5
SAGE (Vals AI)49.4%52.6%GPT-5.6 Sol
MedScribe (Vals AI)91.0%85.2%Claude Opus 5
Vals Multimodal Index73.9%72.6%Claude Opus 5
IFBenchNot measured72.7%Only GPT-5.6 Sol measured
Long context reasoning (AA-LCR)82.0%84.0%GPT-5.6 Sol
DTBench97.9%95.7%Claude Opus 5
LMCA64.5%58.5%Claude Opus 5
Surface Evolver BenchNot measured93.1%Only GPT-5.6 Sol measured
Furniture assembly60.8%56.7%Claude Opus 5
LMArena Text15091457Claude Opus 5
LMArena Text: instruction following15181483Claude Opus 5
LMArena Text: creative writing14931449Claude Opus 5
LMArena Vision13201281Claude Opus 5
LMArena Text: English15081457Claude Opus 5
LMArena Text: non-English15021451Claude Opus 5
LMArena Text: Chinese15731525Claude Opus 5
LMArena Text: German15271476Claude Opus 5
LMArena Text: Japanese15201472Claude Opus 5
LMArena Text: Korean15171442Claude Opus 5
LMArena Text: French15191472Claude Opus 5
LMArena Text: Spanish15231443Claude Opus 5
LMArena Text: Russian15071471Claude Opus 5
LMArena Text: Polish15221459Claude Opus 5
LMArena Text: multi-turn15001461Claude Opus 5
LMArena Text: longer queries15171481Claude Opus 5
LMArena Text: writing and language14991462Claude Opus 5
LMArena Text: entertainment and media14811450Claude Opus 5
LMArena Vision: English13151280Claude Opus 5
LMArena Vision: Chinese14001313Claude Opus 5
LMArena Vision: reading text13291290Claude Opus 5
LMArena Vision: humor12931246Claude Opus 5
LMArena Vision: creative writing13131283Claude Opus 5
LMArena Document15161483Claude Opus 5
Neither model has a result on the other 11 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-5.6 Sol
BenchmarkClaude Opus 5GPT-5.6 SolLeader
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-5.6 Sol$0.014Fits in one request

GPT-5.6 Sol costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
GPT-5.6 Sol$0.260Fits in one request

GPT-5.6 Sol costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
GPT-5.6 Sol$1.00Fits in one request

GPT-5.6 Sol 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-5.6 Sol
SpecificationAnthropic Claude Opus 5OpenAI GPT-5.6 Sol
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026July 9, 2026
Context window1M1.05M
Input $/Mtok$5.00$4.00
Output $/Mtok$25.00$20.00
Coding index81.876.7
Independent measurements behind it22
Cost per solved task$1.33$1.20
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than GPT-5.6 Sol for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 76.7 for GPT-5.6 Sol. Pick GPT-5.6 Sol when output tokens cost 1.3x less, or when a solved task costs $1.20 against $1.33.

Which is cheaper, Claude Opus 5 or GPT-5.6 Sol?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and GPT-5.6 Sol $1.20.

Which has the bigger context window, Claude Opus 5 or GPT-5.6 Sol?

GPT-5.6 Sol, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5 vs GPT-5.6 Sol comparison based on?

129 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-5.6 Sol's on 2. Where only one model has a result, the page says so instead of naming a winner.

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