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Gemini 3.1 Pro Preview vs GPT-5.5

Head to head on 41 shared benchmarks, with price, context window, and release dates.

Benchmark scores

59

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Model
GPT-5.5

OpenAI

86.2%12.9%36.2%68.4%86.0%1315elo1844elo78.251.8%51.7%44.8%24.9%1769elo76.8%15.1%13.7%46.1%2.1%84.7%82.5%81.1%73.0%87.7%96.3%87.7%92.8%49.1%86.9%68.8%78.7%50.0%51.5%47.3%58.6%75.0%83.4%49.2%57.4%68.1%69.8%69.3%54.2%-90.0%100.0%--34.0%5.7%-51.8%-88.6%45.3%100.0%-4.275.7%-61.9%
Gemini 3.1 Pro Preview

Google (Alphabet Inc.)

76.8%12.3%26.5%64.5%22.0%1142elo1489elo68.243.0%36.9%42.5%16.7%1314elo94.1%15.1%47.0%77.1%0.0%82.4%76.5%78.5%79.1%85.4%91.0%84.0%86.3%59.1%76.1%69.4%76.2%26.0%48.7%58.9%54.2%72.9%70.7%53.8%41.9%56.1%32.0%95.6%-2--73.1%22.8%--93.2%-84.4%---72.7%--79.458.9%
2 / 2 models
AttributeGemini 3.1 Pro Preview

Google (Alphabet Inc.)

GPT-5.5

OpenAI

DescriptionGemini 3.1 Pro Preview is an AI model from Google (Alphabet Inc.).GPT-5.5 is an AI model from OpenAI.
FamilyGeminiGPT
Params--
Open weights-closed
License-proprietary
Released19 Feb 202623 Apr 2026
Context1,048,5761,050,000
Input $/1M$2.00$5.00
Output $/1M$12.00$30.00
Cache read $/1M$0.200$0.500
Cache write $/1M$0.375-
Speed122 tok/s0 tok/s
Latency20.68 s0.00 s
Modalitiesaudio, file, image, text, videofile, image, text
Providers--
PublisherGoogle (Alphabet Inc.)OpenAI
Reported scores

FAQ

Is Gemini 3.1 Pro Preview or GPT-5.5 better?
Across the 41 benchmarks both models report on Sophon, GPT-5.5 leads on 31 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Gemini 3.1 Pro Preview and GPT-5.5 compare on GPQA Diamond?
Gemini 3.1 Pro Preview scores 94.1% and GPT-5.5 scores 76.8% on GPQA Diamond.
Which is cheaper, Gemini 3.1 Pro Preview or GPT-5.5?
Gemini 3.1 Pro Preview is cheaper at $12.00 per million output tokens against $30.00 for GPT-5.5 - about 2.5x.
When were Gemini 3.1 Pro Preview and GPT-5.5 released?
Gemini 3.1 Pro Preview was released 19 Feb 2026 by Google (Alphabet Inc.). GPT-5.5 was released 23 Apr 2026 by OpenAI.

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