Updated
Claude Fable 5.1 vs Grok 4.7
Claude Fable 5.1 had 48% fewer counted bugs per line than Grok 4.7 (0.93 vs 1.79).
| Claude Fable 5.1 | Grok 4.7 | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 0.93 | 1.79 |
| Rank | #2 of 8 | #8 of 8 |
| By language | ||
| TypeScript | 1.12 | 1.75 |
| Python | 0.85 | 1.54 |
| Details | ||
| Provider | Anthropic | xAI |
| Released | Sep 1, 2026 | Sep 21, 2026 |
| List price | $10 input / $50 output per 1M tokens | $2 input / $6 output per 1M tokens |
| Share of AI-written code, week of Oct 26 | 6.0% | 1.1% |
1.00 = average · lower is better
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Questions and answers
- Which has fewer bugs, Claude Fable 5.1 or Grok 4.7?
- Claude Fable 5.1 had 48% fewer counted bugs per line than Grok 4.7 (0.93 vs 1.79). Claude Fable 5.1 ranks #2 of 8 and Grok 4.7 #8.
- Which is cheaper, Claude Fable 5.1 or Grok 4.7?
- Claude Fable 5.1 lists at $10 input / $50 output per 1M tokens; Grok 4.7 lists at $2 input / $6 output per 1M tokens. Grok 4.7 has the lower list price.
- Does it depend on the programming language?
- In TypeScript, Claude Fable 5.1 had the lower rate (1.12 vs 1.75); in Python, Claude Fable 5.1 had the lower rate (0.85 vs 1.54).
- Which is used more, Claude Fable 5.1 or Grok 4.7?
- Claude Fable 5.1, with 6.0% of the AI-written code reviewed by cubic in the week of Oct 26, 2026, against 1.1% for Grok 4.7.