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GPT-5 vs Claude Sonnet 4.5
A detailed comparison of GPT-5 (OpenAI) and Claude Sonnet 4.5 (Anthropic) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-5 | Claude Sonnet 4.5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $1.25 | $3.00 | +140% |
| Output / 1M tokens | $10.00 | $15.00 | +50% |
| Context window | 128K | 200K | — |
| Max output | 16.384K | 16K | — |
Benchmark Comparison
| Benchmark | GPT-5 | Claude Sonnet 4.5 |
|---|---|---|
| MMLU-Pro | 88.5% | 84.5% |
| HumanEval | 95% | 93% |
| GPQA | 73.5% | 68.2% |
Capabilities
| Capability | GPT-5 | Claude Sonnet 4.5 |
|---|---|---|
| audio | ✓ | ✗ |
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
GPT-5 Strengths
- ✓Strong all-around performance
- ✓Good price for flagship tier
- ✓Multimodal including audio
GPT-5 Weaknesses
- ✗128K context vs 200K+ for newer models
- ✗Codex variants better for pure coding
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- ✗Superseded by Sonnet 4.6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: GPT-5 is the more affordable option at $1.25/$10 per 1M tokens.
Higher benchmarks: GPT-5 scores higher on average across available benchmarks (85.7% avg).
Larger context: Claude Sonnet 4.5 supports 200K tokens.
Choose GPT-5 if cost matters most. Choose Claude Sonnet 4.5 if you need the best possible quality for complex tasks.