Claude Opus 4.5 vs Gemini 3.5 Flash
Head to head on 23 shared benchmarks, with price, context window, and release dates.
Benchmark scores
47evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Opus 4.5 Anthropic | 61.3% | 73.1 | 20.7% | 86.6% | 30.1% | 58.0% | 78.1% | 79.7% | 74.4% | 62.5% | 81.3% | 90.4% | 80.1% | 45.2% | 83.2% | 68.7% | 36.0% | 45.0% | 49.5% | 74.3% | 47.0% | 20.6% | 89.5% | 91.3% | 16.7% | - | 35.6% | 6.1% | - | 1683elo | - | 84.7% | 12.13 | 83.8% | 83.5% | 87.1% | - | 89.5% | 100.0% | 37.4 | 77.5% | 45.3 | 70.7% | 79.2% | 61.8 | - | - | 64.8% |
| 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% |
2 / 2 models
| Attribute | Claude Opus 4.5 Anthropic | Gemini 3.5 Flash Google (Alphabet Inc.) |
|---|---|---|
| Description | Claude Opus 4.5 is an AI model from Anthropic. | Gemini 3.5 Flash is an AI model from Google (Alphabet Inc.). |
| Family | Claude | Gemini |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 24 Nov 2025 | 19 May 2026 |
| Context | 200,000 | 1,048,576 |
| Input $/1M | $5.00 | $1.50 |
| Output $/1M | $25.00 | $9.00 |
| Cache read $/1M | $0.500 | $0.150 |
| Cache write $/1M | $6.250 | $0.083 |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | file, image, text | text, image, video, file, audio |
| Providers | - | - |
| Publisher | Anthropic | Google (Alphabet Inc.) |
| 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% |
FAQ
- Is Claude Opus 4.5 or Gemini 3.5 Flash better?
- Across the 23 benchmarks both models report on Sophon, Gemini 3.5 Flash leads on 15 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.5 and Gemini 3.5 Flash compare on GPQA Diamond?
- Claude Opus 4.5 scores 86.6% and Gemini 3.5 Flash scores 92.2% on GPQA Diamond.
- Which is cheaper, Claude Opus 4.5 or Gemini 3.5 Flash?
- Gemini 3.5 Flash is cheaper at $9.00 per million output tokens against $25.00 for Claude Opus 4.5 - about 2.8x.
- When were Claude Opus 4.5 and Gemini 3.5 Flash released?
- Claude Opus 4.5 was released 24 Nov 2025 by Anthropic. Gemini 3.5 Flash was released 19 May 2026 by Google (Alphabet Inc.).
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