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GPT-5 vs GPT-5.5

Head to head on 18 shared benchmarks, with price, context window, and release dates.

Benchmark scores

96

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Model
GPT-5.5

OpenAI

68.4%1844elo78.251.7%76.8%13.7%46.1%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%-84.7%82.5%81.1%73.0%87.7%96.3%87.7%------92.8%--------78.7%45.3%100.0%-4.2--58.6%-75.7%83.4%--57.4%68.1%---61.9%
GPT-5

OpenAI

61.1%1623elo72.832.4%68.6%6.6%45.0%49.6%83.7%82.0%65.5%18.0%43.7%37.8%73.4%12.9%20.1%0.0%46.7%91.1%88.0%94.6%48.3%--0.0%-0.15-0.0%68.1%4.58---57.7%80.0%80.0%---91.7%---0.0%-88.9%83.3%-100.0%-48.9%83.4%-58.2%-------54.3%37.5%0.521.62100.0%86.1%-0.0%92.7%92.7%93.3%10.0%0.0%60.0%0.26---0.0%-74.9%74.4%-2.34--87.5%0.86--54.8%90.0%90.0%56.7%
2 / 2 models
AttributeGPT-5

OpenAI

GPT-5.5

OpenAI

DescriptionOpenAI's August 2025 unified frontier model that auto-routes between a fast model and a deeper "thinking" variant.GPT-5.5 is an AI model from OpenAI.
FamilyGPT 5GPT
ParamsUndisclosed (closed)-
Open weightsclosedclosed
LicenseProprietaryproprietary
Released7 Aug 202523 Apr 2026
Context400,0001,050,000
Input $/1M-$5.00
Output $/1M-$30.00
Cache read $/1M$0.125$0.500
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, filefile, image, text
Providersopenai-
PublisherOpenAIOpenAI
Reported scores

FAQ

Is GPT-5 or GPT-5.5 better?
Across the 18 benchmarks both models report on Sophon, GPT-5.5 leads on 17 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5 and GPT-5.5 compare on GPQA Diamond?
GPT-5 scores 68.6% and GPT-5.5 scores 76.8% on GPQA Diamond.
When were GPT-5 and GPT-5.5 released?
GPT-5 was released 7 Aug 2025 by OpenAI. GPT-5.5 was released 23 Apr 2026 by OpenAI.

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