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Claude Opus 4.5 vs GPT-5.5

Head to head on 25 shared benchmarks, with price, context window, and release dates.

Benchmark scores

68

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Model
Claude Opus 4.5

Anthropic

61.3%1683elo73.120.7%81.0%13.2%43.0%78.1%79.7%74.4%62.5%81.3%90.4%80.1%45.2%83.2%88.9%68.7%36.0%45.0%47.0%74.3%40.9%20.6%86.3%62.7%----16.7%---35.6%6.1%-------84.7%-12.13-83.8%83.5%-73.8%-100.0%37.4---77.5%45.3-70.7%79.2%--61.8---62.2%
GPT-5.5

OpenAI

68.4%1844elo78.251.7%76.8%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%50.0%51.5%47.3%75.0%49.2%69.8%69.3%-86.2%54.2%12.9%36.2%-86.0%90.0%100.0%--1315elo34.0%51.8%5.7%44.8%24.9%1769elo-15.1%-51.8%--2.1%-92.8%--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 4.5

Anthropic

GPT-5.5

OpenAI

DescriptionClaude Opus 4.5 is an AI model from Anthropic.GPT-5.5 is an AI model from OpenAI.
FamilyClaudeGPT
Params--
Open weightsclosedclosed
Licenseproprietaryproprietary
Released24 Nov 202523 Apr 2026
Context200,0001,050,000
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
Modalitiesfile, image, textfile, image, text
Providers--
PublisherAnthropicOpenAI
Reported scores

FAQ

Is Claude Opus 4.5 or GPT-5.5 better?
Across the 25 benchmarks both models report on Sophon, GPT-5.5 leads on 22 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Claude Opus 4.5 and GPT-5.5 compare on GPQA Diamond?
Claude Opus 4.5 scores 81.0% and GPT-5.5 scores 76.8% on GPQA Diamond.
Which is cheaper, Claude Opus 4.5 or GPT-5.5?
Claude Opus 4.5 is cheaper at $25.00 per million output tokens against $30.00 for GPT-5.5 - about 1.2x.
When were Claude Opus 4.5 and GPT-5.5 released?
Claude Opus 4.5 was released 24 Nov 2025 by Anthropic. GPT-5.5 was released 23 Apr 2026 by OpenAI.

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