Updated
Claude Opus 4.8 vs Claude Sonnet 5.5
Claude Opus 4.8 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
| Claude Opus 4.8 | Claude Sonnet 5.5 | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | No longer ranked | 0.96 |
| Details | ||
| Provider | Anthropic | Anthropic |
| Released | May 28, 2026 | Sep 28, 2026 |
| List price | $5 input / $25 output per 1M tokens | $2 input / $10 output per 1M tokens |
| Share of AI-written code, week of Sep 28 | 0.2% | 2.4% |
1.00 = average · lower is better
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Questions and answers
- Which has fewer bugs, Claude Opus 4.8 or Claude Sonnet 5.5?
- Claude Opus 4.8 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
- Which is cheaper, Claude Opus 4.8 or Claude Sonnet 5.5?
- Claude Opus 4.8 lists at $5 input / $25 output per 1M tokens; Claude Sonnet 5.5 lists at $2 input / $10 output per 1M tokens. Claude Sonnet 5.5 has the lower list price.
- Which is used more, Claude Opus 4.8 or Claude Sonnet 5.5?
- Claude Sonnet 5.5, with 2.4% of the AI-written code reviewed by cubic in the week of Sep 28, 2026, against 0.2% for Claude Opus 4.8.