Updated
Claude Sonnet 5.5 vs GPT-5.6 Sol
GPT-5.6 Sol had 30% fewer counted bugs per line than Claude Sonnet 5.5 (0.67 vs 0.96).
| Claude Sonnet 5.5 | GPT-5.6 Sol | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 0.96 | 0.67 |
| Rank | #2 of 8 | #1 of 8 |
| By bug type | ||
| Logic bugs(statistically tied) | 0.74 | 0.69 |
| Testing and docs | 1.29 | 0.62 |
| By language | ||
| TypeScript(statistically tied) | 0.54 | 0.70 |
| Python | 1.70 | 0.74 |
| Details | ||
| Provider | Anthropic | OpenAI |
| Released | Sep 28, 2026 | Jul 9, 2026 |
| List price | $2 input / $10 output per 1M tokens | $4 input / $20 output per 1M tokens |
| Share of AI-written code, week of Sep 28 | 2.4% | 2.0% |
1.00 = average · lower is better · = statistically tied
More comparisons
Questions and answers
- Which has fewer bugs, Claude Sonnet 5.5 or GPT-5.6 Sol?
- GPT-5.6 Sol had 30% fewer counted bugs per line than Claude Sonnet 5.5 (0.67 vs 0.96). GPT-5.6 Sol ranks #1 of 8 and Claude Sonnet 5.5 #2.
- Which is cheaper, Claude Sonnet 5.5 or GPT-5.6 Sol?
- Claude Sonnet 5.5 lists at $2 input / $10 output per 1M tokens; GPT-5.6 Sol lists at $4 input / $20 output per 1M tokens. Claude Sonnet 5.5 has the lower list price.
- Does it depend on the programming language?
- In TypeScript, they were statistically tied (0.54 and 0.70); in Python, GPT-5.6 Sol had the lower rate (0.74 vs 1.70).
- Does it depend on the kind of bug?
- For logic bugs, they were statistically tied (0.74 and 0.69); for testing and documentation issues, GPT-5.6 Sol had the lower rate (0.62 vs 1.29).