Updated
Claude Fable 5 vs Claude Sonnet 5.5
Claude Fable 5 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
| Claude Fable 5 | Claude Sonnet 5.5 | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | No longer ranked | 1.07 |
| Details | ||
| Provider | Anthropic | Anthropic |
| Released | Jun 9, 2026 | Sep 28, 2026 |
| List price | $10 input / $50 output per 1M tokens | $2 input / $10 output per 1M tokens |
| Share of AI-written code, week of Oct 12 | 0.2% | 4.8% |
1.00 = average · lower is better
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Questions and answers
- Which has fewer bugs, Claude Fable 5 or Claude Sonnet 5.5?
- Claude Fable 5 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
- Which is cheaper, Claude Fable 5 or Claude Sonnet 5.5?
- Claude Fable 5 lists at $10 input / $50 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 Fable 5 or Claude Sonnet 5.5?
- Claude Sonnet 5.5, with 4.8% of the AI-written code reviewed by cubic in the week of Oct 12, 2026, against 0.2% for Claude Fable 5.