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Claude Sonnet 4.5 vs GPT-4o
A detailed comparison of Claude Sonnet 4.5 (Anthropic) and GPT-4o (OpenAI) across pricing, performance, and features.
Pricing Comparison
| Metric | Claude Sonnet 4.5 | GPT-4o | Difference |
|---|---|---|---|
| Input / 1M tokens | $3.00 | $2.50 | -17% |
| Output / 1M tokens | $15.00 | $10.00 | -33% |
| Context window | 200K | 128K | — |
| Max output | 16K | 16.384K | — |
Benchmark Comparison
| Benchmark | Claude Sonnet 4.5 | GPT-4o |
|---|---|---|
| MMLU-Pro | 84.5% | 80.5% |
| HumanEval | 93% | 91% |
| GPQA | 68.2% | 64.2% |
Capabilities
| Capability | Claude Sonnet 4.5 | GPT-4o |
|---|---|---|
| audio | ✗ | ✓ |
| code | ✓ | ✓ |
| reasoning | ✓ | ✗ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
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- ✗Superseded by Sonnet 4.6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
GPT-4o Strengths
- ✓Well-established and reliable
- ✓Large ecosystem of tools and integrations
GPT-4o Weaknesses
- ✗Being superseded by GPT-5 series
- ✗Higher price than newer, better alternatives
Quick Verdict
Best value: GPT-4o is the more affordable option at $2.5/$10 per 1M tokens.
Higher benchmarks: Claude Sonnet 4.5 scores higher on average across available benchmarks (81.9% avg).
Larger context: Claude Sonnet 4.5 supports 200K tokens.
Choose GPT-4o if cost matters most. Choose Claude Sonnet 4.5 if you need the best possible quality for complex tasks.