Gemini 3.1 Pro Preview vs Gemini 3.5 Flash
Head to head on 29 shared benchmarks, with price, context window, and release dates.
Benchmark scores
48evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Gemini 3.1 Pro Preview Google (Alphabet Inc.) | 64.5% | 22.0% | 1142elo | 68.2 | 43.0% | 36.9% | 94.1% | 47.0% | 77.1% | 82.4% | 76.5% | 78.5% | 79.1% | 85.4% | 91.0% | 84.0% | 86.3% | 59.1% | 76.1% | 69.4% | 26.0% | 48.7% | 58.9% | 72.9% | 53.8% | 41.9% | 56.1% | 32.0% | 95.6% | 76.8% | 12.3% | 26.5% | 2 | 73.1% | 22.8% | 1489elo | 42.5% | 16.7% | 1314elo | 93.2% | 15.1% | 84.4% | 0.0% | 76.2% | 72.7% | 54.2% | 70.7% | 79.4 | 58.9% |
2 / 2 models
| Attribute | Gemini 3.1 Pro Preview Google (Alphabet Inc.) | Gemini 3.5 Flash Google (Alphabet Inc.) |
|---|---|---|
| Description | Gemini 3.1 Pro Preview is an AI model from Google (Alphabet Inc.). | Gemini 3.5 Flash is an AI model from Google (Alphabet Inc.). |
| Family | Gemini | Gemini |
| Params | - | - |
| Open weights | - | closed |
| License | - | proprietary |
| Released | 19 Feb 2026 | 19 May 2026 |
| Context | 1,048,576 | 1,048,576 |
| Input $/1M | $2.00 | $1.50 |
| Output $/1M | $12.00 | $9.00 |
| Cache read $/1M | $0.200 | $0.150 |
| Cache write $/1M | $0.375 | $0.083 |
| Speed | 113 tok/s | 0 tok/s |
| Latency | 24.57 s | 0.00 s |
| Modalities | audio, file, image, text, video | text, image, video, file, audio |
| Providers | - | - |
| Publisher | Google (Alphabet Inc.) | Google (Alphabet Inc.) |
| Reported scores | GPQA Diamond94.1% (AA) Humanity's Last Exam (HLE)47.0% (AA) IFBench77.1% (AA) SciCode58.9% (AA) τ²-bench (Tau²-bench)95.6% (AA) | Humanity's Last Exam (HLE)42.7% (AA) τ²-bench (Tau²-bench)95.3% (AA) Terminal-Bench (Hard)40.9% (AA) Vals Index53.1% |
FAQ
- Is Gemini 3.1 Pro Preview or Gemini 3.5 Flash better?
- Across the 29 benchmarks both models report on Sophon, Gemini 3.1 Pro Preview leads on 16 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 Gemini 3.5 Flash compare on GPQA Diamond?
- Gemini 3.1 Pro Preview scores 94.1% and Gemini 3.5 Flash scores 92.2% on GPQA Diamond.
- Which is cheaper, Gemini 3.1 Pro Preview or Gemini 3.5 Flash?
- Gemini 3.5 Flash is cheaper at $9.00 per million output tokens against $12.00 for Gemini 3.1 Pro Preview - about 1.3x.
- When were Gemini 3.1 Pro Preview and Gemini 3.5 Flash released?
- Gemini 3.1 Pro Preview was released 19 Feb 2026 by Google (Alphabet Inc.). Gemini 3.5 Flash was released 19 May 2026 by Google (Alphabet Inc.).
Comparing something else? Build your own side-by-side.