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Gemini 3.5 Flash vs GPT-5.5

Head to head on 29 shared benchmarks, with price, context window, and release dates.

Benchmark scores

52

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Model
GPT-5.5

OpenAI

68.4%86.0%1315elo78.251.8%51.7%93.5%45.8%75.9%84.7%82.5%81.1%73.0%87.7%96.3%87.7%92.8%49.1%86.9%68.8%50.0%51.5%56.1%75.0%60.6%57.4%68.1%69.8%93.9%86.2%54.2%12.9%36.2%90.0%100.0%1844elo34.0%5.7%44.8%24.9%1769elo15.1%51.8%2.1%88.6%78.7%45.3%100.0%4.258.6%75.7%83.4%64.6%
Gemini 3.5 Flash

Google (Alphabet Inc.)

64.7%26.0%1087elo71.857.9%39.0%92.2%42.7%76.3%78.9%78.2%64.9%75.6%84.6%88.2%82.0%76.3%55.8%76.6%68.1%31.0%49.9%53.1%74.4%40.9%53.1%62.9%48.7%95.3%-----------------------64.3%
2 / 2 models
AttributeGemini 3.5 Flash

Google (Alphabet Inc.)

GPT-5.5

OpenAI

DescriptionGemini 3.5 Flash is an AI model from Google (Alphabet Inc.).GPT-5.5 is an AI model from OpenAI.
FamilyGeminiGPT
Params--
Open weightsclosedclosed
Licenseproprietaryproprietary
Released19 May 202623 Apr 2026
Context1,048,5761,050,000
Input $/1M$1.50$5.00
Output $/1M$9.00$30.00
Cache read $/1M$0.150$0.500
Cache write $/1M$0.083-
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, video, file, audiofile, image, text
Providers--
PublisherGoogle (Alphabet Inc.)OpenAI
Reported scores

FAQ

Is Gemini 3.5 Flash or GPT-5.5 better?
Across the 29 benchmarks both models report on Sophon, GPT-5.5 leads on 24 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Gemini 3.5 Flash and GPT-5.5 compare on GPQA Diamond?
Gemini 3.5 Flash scores 92.2% and GPT-5.5 scores 93.5% on GPQA Diamond.
Which is cheaper, Gemini 3.5 Flash or GPT-5.5?
Gemini 3.5 Flash is cheaper at $9.00 per million output tokens against $30.00 for GPT-5.5 - about 3.3x.
When were Gemini 3.5 Flash and GPT-5.5 released?
Gemini 3.5 Flash was released 19 May 2026 by Google (Alphabet Inc.). GPT-5.5 was released 23 Apr 2026 by OpenAI.

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