0

Claude Opus 4.6 vs GPT-5.5

Head to head on 28 shared benchmarks, with price, context window, and release dates.

Benchmark scores

63

evals · sort by any column, ⤢ to expand fullscreen

Model
Claude Opus 4.6

Anthropic

56.1%67.0%71.0%1223elo1804elo77.740.7%84.0%19.1%44.6%78.8%78.2%69.9%63.3%83.3%89.3%88.7%78.5%48.2%86.7%68.5%50.0%51.6%45.7%76.0%48.5%57.6%84.8%99.79--1.5-2.08----------84.9%8877158--93---44.5-72.0%75.6%---80.6--66.5%
GPT-5.5

OpenAI

12.9%68.4%86.0%1315elo1844elo78.251.7%76.8%13.7%46.1%84.7%82.5%81.1%73.0%87.7%96.3%87.7%92.8%49.1%86.9%68.8%50.0%51.5%47.3%75.0%49.2%69.8%69.3%-86.2%54.2%-36.2%-90.0%100.0%34.0%51.8%5.7%44.8%24.9%1769elo15.1%51.8%---2.1%88.6%-78.7%45.3%100.0%-4.2--58.6%75.7%83.4%-57.4%68.1%61.9%
2 / 2 models
AttributeClaude Opus 4.6

Anthropic

GPT-5.5

OpenAI

DescriptionClaude Opus 4.6 is an AI model from Anthropic.GPT-5.5 is an AI model from OpenAI.
FamilyClaudeGPT
Params--
Open weightsclosedclosed
Licenseproprietaryproprietary
Released5 Feb 202623 Apr 2026
Context1,000,0001,050,000
Input $/1M$5.00$5.00
Output $/1M$25.00$30.00
Cache read $/1M$0.500$0.500
Cache write $/1M$6.250-
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, filefile, image, text
Providers--
PublisherAnthropicOpenAI
Reported scores

FAQ

Is Claude Opus 4.6 or GPT-5.5 better?
Across the 28 benchmarks both models report on Sophon, GPT-5.5 leads on 20 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Claude Opus 4.6 and GPT-5.5 compare on GPQA Diamond?
Claude Opus 4.6 scores 84.0% and GPT-5.5 scores 76.8% on GPQA Diamond.
Which is cheaper, Claude Opus 4.6 or GPT-5.5?
Claude Opus 4.6 is cheaper at $25.00 per million output tokens against $30.00 for GPT-5.5 - about 1.2x.
When were Claude Opus 4.6 and GPT-5.5 released?
Claude Opus 4.6 was released 5 Feb 2026 by Anthropic. GPT-5.5 was released 23 Apr 2026 by OpenAI.

Comparing something else? Build your own side-by-side.