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Gemini 3.1 Pro vs Claude Sonnet 4.5
A detailed comparison of Gemini 3.1 Pro (Google) and Claude Sonnet 4.5 (Anthropic) across pricing, performance, and features.
Pricing Comparison
| Metric | Gemini 3.1 Pro | Claude Sonnet 4.5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.00 | $3.00 | +50% |
| Output / 1M tokens | $12.00 | $15.00 | +25% |
| Context window | 1M | 200K | — |
| Max output | 64K | 16K | — |
Benchmark Comparison
| Benchmark | Gemini 3.1 Pro | Claude Sonnet 4.5 |
|---|---|---|
| MMLU-Pro | 91% | 84.5% |
| HumanEval | 95% | 93% |
| GPQA | 94.3% | 68.2% |
Capabilities
| Capability | Gemini 3.1 Pro | Claude Sonnet 4.5 |
|---|---|---|
| audio | ✓ | ✗ |
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
Gemini 3.1 Pro Strengths
- ✓#1 on 12 of 18 tracked benchmarks
- ✓94.3% GPQA Diamond — highest of any model
- ✓Same price as Gemini 3 Pro (free upgrade)
- ✓1M context with configurable thinking levels
Gemini 3.1 Pro Weaknesses
- ✗Still in preview
- ✗Context-tiered pricing ($4/$18 above 200K)
Claude Sonnet 4.5 Strengths
- ✓Well-tested and stable
- ✓Strong coding and analysis
Claude Sonnet 4.5 Weaknesses
- ✗Superseded by Sonnet 4.6
- ✗Same price as the newer model
Quick Verdict
Best value: Gemini 3.1 Pro is the more affordable option at $2/$12 per 1M tokens.
Higher benchmarks: Gemini 3.1 Pro scores higher on average across available benchmarks (93.4% avg).
Larger context: Gemini 3.1 Pro supports 1M tokens.
Choose Gemini 3.1 Pro if cost matters most. Choose Claude Sonnet 4.5 if you need the best possible quality for complex tasks.