Claude Fable 5.1 vs Grok 4.1
Claude Fable 5.1 
Grok 4.1 Verdict
- Claude Fable 5.1 (max) leads on quality: 70.1 vs 57.4.
- Claude Fable 5.1 (max) is stronger in coding, composite, human preference, knowledge, maths, reasoning.
- Grok 4.1 (thinking) is stronger in agents & tools, multimodal.
- Grok 4.1 (thinking) is 13× cheaper ($1.56 vs $20.00 per 1M blended).
| Metric | Claude Fable 5.1 (max) | Grok 4.1 (thinking) |
|---|---|---|
| BenchLeader Index | 70.1 | 57.4 |
| Agents & tools score | 67.2 | 78.3 |
| Coding score | 78.1 | 47.5 |
| Composite score | 76.6 | – |
| Human preference score | 70.8 | 66.4 |
| Knowledge score | 75.9 | 57.2 |
| Maths score | 77.0 | 48.3 |
| Reasoning score | 71.8 | 58.9 |
| Multimodal score | – | 53.2 |
| Blended price $/M | $20.00 | $1.56 |
| Output speed | 67 tok/s | – |
| Time to first answer | 258.6 s | – |
| Context window | 1M | 2M |
| FrontierMath Tiers 1–3 | 90.2% | – |
| FrontierMath Tier 4 | 87.8% | – |
| OTIS Mock AIME | 100.0% | – |
| SimpleQA Verified | 70.8% | – |
| Terminal-Bench | 57.9% | – |
| SimpleBench | – | 56.0% |
| SciCode | 62.0% | – |
| WeirdML | 92.9% | – |
| ProofBench | 100.0% | 4.0% |
| LMArena Text | 1501 | 1465 |
| LMArena Hard Prompts | 1519 | 1477 |
| LMArena Coding | 1519 | 1499 |
| LMArena WebDev | 1758 | 1240 |
| LMArena Vision | – | 1199 |
| LMArena Agent | 13.9 | – |
| LiveBench | 83.4% | – |
| LiveBench Reasoning | 91.7% | – |
| LiveBench Coding | 86.4% | – |
| LiveBench Agentic Coding | 66.1% | – |
| LiveBench Mathematics | 97.0% | – |
| LiveBench Data Analysis | 80.3% | – |
| LiveBench Language | 89.5% | – |
| AIME (Vals) | – | 91.9% |
| LiveCodeBench | – | 80.6% |
| MMLU-Pro | – | 84.2% |
| LegalBench | – | 82.5% |
| CorpFin | – | 66.0% |
| TaxEval | – | 73.1% |
| MedQA | – | 92.1% |
| MGSM | – | 89.5% |
| SWE-bench (Vals) | – | 41.4% |
| GPQA Diamond (Vals) | – | 84.3% |
| AIME 2026 | – | 94.2% |
| HMMT February 2026 | – | 86.4% |
| MathArena Apex | – | 5.2% |
| ARC-AGI-1 | 97.5% | – |
| ARC-AGI-2 | 90.0% | – |
| BFCL Overall | – | 69.6% |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
Claude Fable 5.1 vs Grok 4.1: questions
- Is Claude Fable 5.1 better than Grok 4.1?
- Claude Fable 5.1 (max) leads on quality: 70.1 vs 57.4. The BenchLeader Index combines every independent quality benchmark; Claude Fable 5.1 (max) is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is Claude Fable 5.1 better than Grok 4.1 for coding?
- Claude Fable 5.1 scores higher in coding (78 vs 48 on the category index, where 50 is average).
- Is Claude Fable 5.1 better than Grok 4.1 for agentic tasks?
- Grok 4.1 scores higher in agentic tasks (78 vs 67 on the category index, where 50 is average).
- Which is cheaper, Claude Fable 5.1 or Grok 4.1?
- Grok 4.1 is cheaper: $1.56 against $20.00 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Grok 4.1 accepts more context: 2M against 1M tokens.