Updated
Claude Fable 5 vs Claude Sonnet 5
Claude Fable 5 had 67% fewer counted bugs per line than Claude Sonnet 5 (0.70 vs 2.10).
| Claude Fable 5 | Claude Sonnet 5 | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 0.70 | 2.10 |
| Rank | #2 of 9 | #9 of 9 |
| By coding agent | ||
| Claude Code | 0.72 | 2.12 |
| Details | ||
| Provider | Anthropic | Anthropic |
| Released | Jun 9, 2026 | Jun 30, 2026 |
| List price | $10 input / $50 output per 1M tokens | $2 input / $10 output per 1M tokens |
| Share of AI-written code, week of Sep 14 | 0.9% | 4.0% |
1.00 = average · lower is better
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Questions and answers
- Which has fewer bugs, Claude Fable 5 or Claude Sonnet 5?
- Claude Fable 5 had 67% fewer counted bugs per line than Claude Sonnet 5 (0.70 vs 2.10). Claude Fable 5 ranks #2 of 9 and Claude Sonnet 5 #9.
- Which is cheaper, Claude Fable 5 or Claude Sonnet 5?
- Claude Fable 5 lists at $10 input / $50 output per 1M tokens; Claude Sonnet 5 lists at $2 input / $10 output per 1M tokens. Claude Sonnet 5 has the lower list price.
- Which is used more, Claude Fable 5 or Claude Sonnet 5?
- Claude Sonnet 5, with 4.0% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 0.9% for Claude Fable 5.