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GPT-4.1 vs GPT-5.5

Head to head on 12 shared benchmarks, with price, context window, and release dates.

Benchmark scores

78

evals · sort by any column, ⤢ to expand fullscreen

Model
GPT-5.5

OpenAI

68.4%1844elo51.7%76.8%13.7%46.1%88.6%68.8%47.3%75.0%49.2%69.3%-----86.2%54.2%-12.9%-36.2%--86.0%90.0%100.0%-1315elo78.234.0%51.8%5.7%44.8%24.9%1769elo-15.1%51.8%2.1%84.7%82.5%81.1%73.0%87.7%96.3%87.7%-----92.8%--49.1%-86.9%-78.7%45.3%100.0%50.0%51.5%-4.2--58.6%-75.7%83.4%57.4%68.1%69.8%--61.9%
GPT-4.1

OpenAI

63.1%1417elo5.5%66.6%4.2%43.0%80.6%65.9%38.1%75.1%13.6%47.1%0.0%52.4%43.7%34.7%26.7%--61.5%-1.64-83.7%1.55---12.4%--------60.9%----------45.7%70.8%0.490.4991.3%-32.1%32.1%-69.4%-50.5%-----8.57-31.1%39.6%-10.0%-----92.0%92.0%48.0%
2 / 2 models
AttributeGPT-4.1

OpenAI

GPT-5.5

OpenAI

DescriptionGPT-4.1 is an AI model from OpenAI.GPT-5.5 is an AI model from OpenAI.
FamilyGPTGPT
Params--
Open weightsclosedclosed
Licenseproprietaryproprietary
Released14 Apr 202523 Apr 2026
Context1,047,5761,050,000
Input $/1M$2.00$5.00
Output $/1M$8.00$30.00
Cache read $/1M$0.500$0.500
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiesimage, text, filefile, image, text
Providers--
PublisherOpenAIOpenAI
Reported scores

FAQ

Is GPT-4.1 or GPT-5.5 better?
Across the 12 benchmarks both models report on Sophon, GPT-5.5 leads on 11 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-4.1 and GPT-5.5 compare on GPQA Diamond?
GPT-4.1 scores 66.6% and GPT-5.5 scores 76.8% on GPQA Diamond.
Which is cheaper, GPT-4.1 or GPT-5.5?
GPT-4.1 is cheaper at $8.00 per million output tokens against $30.00 for GPT-5.5 - about 3.8x.
When were GPT-4.1 and GPT-5.5 released?
GPT-4.1 was released 14 Apr 2025 by OpenAI. GPT-5.5 was released 23 Apr 2026 by OpenAI.

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