Updated
Claude Fable 5 vs Claude Opus 5
Claude Fable 5 had 56% fewer counted bugs per line than Claude Opus 5 (0.70 vs 1.58).
| Claude Fable 5 | Claude Opus 5 | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 0.70 | 1.58 |
| Rank | #2 of 9 | #8 of 9 |
| By coding agent | ||
| Claude Code | 0.72 | 1.58 |
| Cursor | 0.17 | 1.16 |
| Details | ||
| Provider | Anthropic | Anthropic |
| Released | Jun 9, 2026 | Jul 24, 2026 |
| List price | $10 input / $50 output per 1M tokens | $5 input / $25 output per 1M tokens |
| Share of AI-written code, week of Sep 14 | 0.9% | 38.3% |
1.00 = average · lower is better
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Questions and answers
- Which has fewer bugs, Claude Fable 5 or Claude Opus 5?
- Claude Fable 5 had 56% fewer counted bugs per line than Claude Opus 5 (0.70 vs 1.58). Claude Fable 5 ranks #2 of 9 and Claude Opus 5 #8.
- Which is cheaper, Claude Fable 5 or Claude Opus 5?
- Claude Fable 5 lists at $10 input / $50 output per 1M tokens; Claude Opus 5 lists at $5 input / $25 output per 1M tokens. Claude Opus 5 has the lower list price.
- Which is used more, Claude Fable 5 or Claude Opus 5?
- Claude Opus 5, with 38.3% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 0.9% for Claude Fable 5.