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Claude 4 Sonnet vs GPT-5.5

Head to head on 23 shared benchmarks, with price, context window, and release dates.

Benchmark scores

69

evals · sort by any column, ⤢ to expand fullscreen

Model
GPT-5.5

OpenAI

68.4%1844elo78.276.8%13.7%46.1%84.7%82.5%81.1%73.0%87.7%96.3%87.7%49.1%86.9%88.6%68.8%78.7%51.5%47.3%75.0%49.2%69.3%--86.2%54.2%12.9%-36.2%-86.0%90.0%100.0%-1315elo34.0%51.8%5.7%51.7%44.8%24.9%1769elo-15.1%51.8%2.1%--92.8%-45.3%100.0%50.0%--4.2---58.6%75.7%83.4%-57.4%68.1%69.8%--61.9%
Claude 4 Sonnet

Anthropic

54.7%1480elo58.468.3%4.3%45.4%64.8%77.5%54.6%44.3%72.9%70.5%69.0%33.9%72.4%83.7%62.5%43.9%35.0%37.3%69.6%27.3%52.3%40.7%38.0%---22.9%-47.8%---19.8%--------67.5%---44.9%93.4%-86.7%---6.186.18-58.3%35.6%74.6%---0.59---84.0%84.0%55.5%
2 / 2 models
AttributeClaude 4 Sonnet

Anthropic

GPT-5.5

OpenAI

DescriptionClaude 4 Sonnet is an AI model from Anthropic.GPT-5.5 is an AI model from OpenAI.
FamilyClaudeGPT
Params--
Open weightsclosedclosed
Licenseproprietaryproprietary
Released22 May 202523 Apr 2026
Context200,0001,050,000
Input $/1M$3.00$5.00
Output $/1M$15.00$30.00
Cache read $/1M-$0.500
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, imagefile, image, text
Providers--
PublisherAnthropicOpenAI
Reported scores

FAQ

Is Claude 4 Sonnet or GPT-5.5 better?
Across the 23 benchmarks both models report on Sophon, GPT-5.5 leads on 23 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Claude 4 Sonnet and GPT-5.5 compare on GPQA Diamond?
Claude 4 Sonnet scores 68.3% and GPT-5.5 scores 76.8% on GPQA Diamond.
Which is cheaper, Claude 4 Sonnet or GPT-5.5?
Claude 4 Sonnet is cheaper at $15.00 per million output tokens against $30.00 for GPT-5.5 - about 2.0x.
When were Claude 4 Sonnet and GPT-5.5 released?
Claude 4 Sonnet was released 22 May 2025 by Anthropic. GPT-5.5 was released 23 Apr 2026 by OpenAI.

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