Claude Fable 5.1 vs Grok 4.7
Claude Fable 5.1 vs Grok 4.7: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- Grok 4.7 is 6.7× cheaper than Claude Fable 5.1 for the same mix of input and output tokens.
- Claude Fable 5.1 has the larger context window (1M), useful for long documents and big codebases.
- Grok 4.7 is the more recent release (Sep 21, 2026).
- Choose Grok 4.7 if cost matters most; choose Claude Fable 5.1 if you need its specific strengths above. For the best results, test both on your own prompts.
| Claude Fable 5.1 | Grok 4.7 | |
|---|---|---|
| Company | Anthropic | xAI |
| Released | Sep 1, 2026 | Sep 21, 2026 ● |
| Overall index | 165.0 | — |
| AIME math | 100% | — |
| FrontierMath | 90.2% | — |
| SimpleQA Verified | 70.8% | — |
| Input (per 1M tokens) | $10 | $2 ● |
| Output (per 1M tokens) | $50 | $6 ● |
| Cost for 1M input + 1M output tokens | $60.00 | $8.00 ● |
| Providers | 4 | 5 ● |
| Context | 1M ● | 500K |
| Max output | 128K | 450K ● |
| Inputs | Text, Image, Files | Text, Image, Files |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | — |