Claude Sonnet 4.5 vs Gemini 3.5 Flash
Head to head on 23 shared benchmarks, with price, context window, and release dates.
Benchmark scores
88evals · sort by any column, ⤢ to expand fullscreen
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| Gemini 3.5 Flash Google (Alphabet Inc.) | 64.7% | 71.8 | 39.0% | 92.2% | 42.7% | 76.3% | 78.9% | 78.2% | 64.9% | 75.6% | 84.6% | 88.2% | 82.0% | 55.8% | 76.6% | 68.1% | 31.0% | 49.9% | 53.1% | 74.4% | 40.9% | 48.7% | 95.3% | - | - | - | - | - | - | - | - | - | - | - | 26.0% | - | - | 1087elo | - | - | - | 57.9% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 76.3% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 53.1% | 62.9% | - | - | 64.3% |
| Claude Sonnet 4.5 Anthropic | 60.8% | 71.4 | 15.2% | 83.4% | 17.8% | 57.3% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 40.6% | 84.5% | 64.0% | 19.0% | 32.9% | 44.7% | 73.3% | 35.6% | 22.6% | 78.1% | 0.0% | 0.0% | 88.0% | 100 | 0.0% | 0.0% | 0.0% | 5.0% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | - | 1675elo | 0.0% | 0.0% | - | 0.0% | 0.0% | 83.9% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 87.5% | 83.8% | 0.0% | 0.0% | 71.4% | 0.75 | 0.75 | 0.0% | - | 0 | 0 | 87.5% | 0.0% | 0.0% | 62.9% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0 | 0.0% | 0.0% | 77.2% | 67.0% | 74.8% | 0.0% | 0 | 0 | 50.34 | 0 | - | - | 0.0% | 1.49 | 29.2% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | Gemini 3.5 Flash Google (Alphabet Inc.) |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | Gemini 3.5 Flash is an AI model from Google (Alphabet Inc.). |
| Family | Claude | Gemini |
| Params | Undisclosed (closed) | - |
| Open weights | closed | closed |
| License | Proprietary | proprietary |
| Released | 29 Sep 2025 | 19 May 2026 |
| Context | 1,000,000 | 1,048,576 |
| Input $/1M | $3.00 | $1.50 |
| Output $/1M | $15.00 | $9.00 |
| Cache read $/1M | $0.300 | $0.150 |
| Cache write $/1M | $3.750 | $0.083 |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image, video, file, audio |
| Providers | anthropic, aws-bedrock, vertex-ai | - |
| Publisher | Anthropic | Google (Alphabet Inc.) |
| Reported scores | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) | 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 Claude Sonnet 4.5 or Gemini 3.5 Flash better?
- Across the 23 benchmarks both models report on Sophon, Gemini 3.5 Flash leads on 21 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Sonnet 4.5 and Gemini 3.5 Flash compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 83.4% and Gemini 3.5 Flash scores 92.2% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or Gemini 3.5 Flash?
- Gemini 3.5 Flash is cheaper at $9.00 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 1.7x.
- When were Claude Sonnet 4.5 and Gemini 3.5 Flash released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. Gemini 3.5 Flash was released 19 May 2026 by Google (Alphabet Inc.).
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