Updated
Claude Fable 5 vs Claude Opus 4.8
Claude Fable 5 had 21% fewer counted bugs per line than Claude Opus 4.8 (0.70 vs 0.88).
| Claude Fable 5 | Claude Opus 4.8 | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 0.70 | 0.88 |
| Rank | #2 of 9 | #4 of 9 |
| By coding agent | ||
| Claude Code | 0.72 | 0.86 |
| Cursor | 0.17 | 1.13 |
| Details | ||
| Provider | Anthropic | Anthropic |
| Released | Jun 9, 2026 | May 28, 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% | 1.9% |
1.00 = average · lower is better
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Questions and answers
- Which has fewer bugs, Claude Fable 5 or Claude Opus 4.8?
- Claude Fable 5 had 21% fewer counted bugs per line than Claude Opus 4.8 (0.70 vs 0.88). Claude Fable 5 ranks #2 of 9 and Claude Opus 4.8 #4.
- Which is cheaper, Claude Fable 5 or Claude Opus 4.8?
- Claude Fable 5 lists at $10 input / $50 output per 1M tokens; Claude Opus 4.8 lists at $5 input / $25 output per 1M tokens. Claude Opus 4.8 has the lower list price.
- Which is used more, Claude Fable 5 or Claude Opus 4.8?
- Claude Opus 4.8, with 1.9% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 0.9% for Claude Fable 5.