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Gemini 2.5 Flash vs Claude Sonnet 4.5
A detailed comparison of Gemini 2.5 Flash (Google) and Claude Sonnet 4.5 (Anthropic) across pricing, performance, and features.
Pricing Comparison
| Metric | Gemini 2.5 Flash | Claude Sonnet 4.5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $0.15 | $3.00 | +1900% |
| Output / 1M tokens | $0.60 | $15.00 | +2400% |
| Context window | 1M | 200K | — |
| Max output | 65.536K | 16K | — |
Benchmark Comparison
| Benchmark | Gemini 2.5 Flash | Claude Sonnet 4.5 |
|---|---|---|
| MMLU-Pro | 76% | 84.5% |
| HumanEval | 89.5% | 93% |
| GPQA | — | 68.2% |
Capabilities
| Capability | Gemini 2.5 Flash | Claude Sonnet 4.5 |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
Gemini 2.5 Flash Strengths
- ✓One of the cheapest models available
- ✓1M context at budget pricing
- ✓Free tier available
Gemini 2.5 Flash Weaknesses
- ✗Weaker than Flash 3 on most benchmarks
- ✗Output quality inconsistent on edge cases
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- ✗Superseded by Sonnet 4.6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 2.5 Flash is the more affordable option at $0.15/$0.6 per 1M tokens.
Higher benchmarks: Gemini 2.5 Flash scores higher on average across available benchmarks (82.8% avg).
Larger context: Gemini 2.5 Flash supports 1M tokens.
Choose Gemini 2.5 Flash if cost matters most. Choose Claude Sonnet 4.5 if you need the best possible quality for complex tasks.