Gemini 3.5 Flash vs GPT-5.5
Head to head on 29 shared benchmarks, with price, context window, and release dates.
Benchmark scores
52evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GPT-5.5 OpenAI | 68.4% | 86.0% | 1315elo | 78.2 | 51.8% | 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% | 1844elo | 34.0% | 5.7% | 44.8% | 24.9% | 1769elo | 15.1% | 51.8% | 2.1% | 88.6% | 78.7% | 45.3% | 100.0% | 4.2 | 58.6% | 75.7% | 83.4% | 64.6% |
| Gemini 3.5 Flash Google (Alphabet Inc.) | 64.7% | 26.0% | 1087elo | 71.8 | 57.9% | 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
| Attribute | Gemini 3.5 Flash Google (Alphabet Inc.) | GPT-5.5 OpenAI |
|---|---|---|
| Description | Gemini 3.5 Flash is an AI model from Google (Alphabet Inc.). | GPT-5.5 is an AI model from OpenAI. |
| Family | Gemini | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 19 May 2026 | 23 Apr 2026 |
| Context | 1,048,576 | 1,050,000 |
| Input $/1M | $1.50 | $5.00 |
| Output $/1M | $9.00 | $30.00 |
| Cache read $/1M | $0.150 | $0.500 |
| Cache write $/1M | $0.083 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, video, file, audio | file, image, text |
| Providers | - | - |
| Publisher | Google (Alphabet Inc.) | OpenAI |
| Reported scores | Humanity's Last Exam (HLE)42.7% (AA) τ²-bench (Tau²-bench)95.3% (AA) Terminal-Bench (Hard)40.9% (AA) Vals Index53.1% | GPQA Diamond93.5% (AA) Humanity's Last Exam (HLE)45.8% (AA) IFBench75.9% (AA) SciCode56.1% (AA) τ²-bench (Tau²-bench)93.9% (AA) |
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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