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GPT-4o-mini vs GPT-5.5

Head to head on 13 shared benchmarks, with price, context window, and release dates.

Benchmark scores

75

evals · sort by any column, ⤢ to expand fullscreen

Model
GPT-5.5

OpenAI

68.4%1844elo76.8%13.7%46.1%84.7%82.5%73.0%87.7%88.6%68.8%47.3%75.0%-----86.2%54.2%12.9%36.2%--86.0%90.0%100.0%-1315elo78.234.0%51.8%5.7%51.7%44.8%24.9%1769elo15.1%--51.8%-2.1%-81.1%96.3%87.7%--92.8%49.1%-86.9%-78.7%45.3%100.0%50.0%51.5%-4.258.6%-75.7%83.4%49.2%-57.4%68.1%69.8%----69.3%61.9%
GPT-4o-mini

OpenAI

45.5%871elo42.6%4.2%31.0%47.2%43.0%65.8%32.9%64.8%54.5%22.9%60.5%16.7%3.6%11.7%14.7%50.7%----0.290.0%---0.0%----------0.0%1.54-0.0%-72.0%---23.4%78.9%--62.8%-78.0%-----3.81--100.0%---0.36---0.7883.3%54.5%22.5%-39.6%
2 / 2 models
AttributeGPT-4o-mini

OpenAI

GPT-5.5

OpenAI

DescriptionGPT-4o Mini is an AI model from OpenAI.GPT-5.5 is an AI model from OpenAI.
FamilyGPTGPT
Params--
Open weightsclosedclosed
Licenseproprietaryproprietary
Released18 Jul 202423 Apr 2026
Context128,0001,050,000
Input $/1M$0.15$5.00
Output $/1M$0.60$30.00
Cache read $/1M$0.075$0.500
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, filefile, image, text
Providers--
PublisherOpenAIOpenAI
Reported scores

FAQ

Is GPT-4o-mini or GPT-5.5 better?
Across the 13 benchmarks both models report on Sophon, GPT-5.5 leads on 13 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-4o-mini and GPT-5.5 compare on GPQA Diamond?
GPT-4o-mini scores 42.6% and GPT-5.5 scores 76.8% on GPQA Diamond.
Which is cheaper, GPT-4o-mini or GPT-5.5?
GPT-4o-mini is cheaper at $0.60 per million output tokens against $30.00 for GPT-5.5 - about 50.0x.
When were GPT-4o-mini and GPT-5.5 released?
GPT-4o-mini was released 18 Jul 2024 by OpenAI. GPT-5.5 was released 23 Apr 2026 by OpenAI.

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