Updated
Claude Opus 5 vs GPT-5.5
GPT-5.5 had 71% fewer counted bugs per line than Claude Opus 5 (0.47 vs 1.58).
| Claude Opus 5 | GPT-5.5 | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 1.58 | 0.47 |
| Rank | #8 of 9 | #1 of 9 |
| By coding agent | ||
| Cursor(statistically tied) | 1.16 | 0.88 |
| Details | ||
| Provider | Anthropic | OpenAI |
| Released | Jul 24, 2026 | Apr 23, 2026 |
| List price | $5 input / $25 output per 1M tokens | $5 input / $30 output per 1M tokens |
| Share of AI-written code, week of Sep 14 | 38.3% | 0.1% |
1.00 = average · lower is better · = statistically tied
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Questions and answers
- Which has fewer bugs, Claude Opus 5 or GPT-5.5?
- GPT-5.5 had 71% fewer counted bugs per line than Claude Opus 5 (0.47 vs 1.58). GPT-5.5 ranks #1 of 9 and Claude Opus 5 #8.
- Which is cheaper, Claude Opus 5 or GPT-5.5?
- Claude Opus 5 lists at $5 input / $25 output per 1M tokens; GPT-5.5 lists at $5 input / $30 output per 1M tokens. Claude Opus 5 has the lower list price.
- Which is used more, Claude Opus 5 or GPT-5.5?
- Claude Opus 5, with 38.3% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 0.1% for GPT-5.5.