Claude Fable 5 vs Grok 4.1
Claude Fable 5 
Grok 4.1 Verdict
- Claude Fable 5 leads on quality: 68.8 vs 57.4.
- Claude Fable 5 is stronger in coding, composite, human preference, instruction following, knowledge, long context, multimodal, reasoning.
- Grok 4.1 (thinking) is stronger in agents & tools, maths.
- Grok 4.1 (thinking) is 13× cheaper ($1.56 vs $20.00 per 1M blended).
| Metric | Claude Fable 5 | Grok 4.1 (thinking) |
|---|---|---|
| BenchLeader Index | 68.8 | 57.4 |
| Agents & tools score | 73.6 | 78.3 |
| Coding score | 68.7 | 47.5 |
| Composite score | 84.1 | – |
| Human preference score | 71.4 | 66.4 |
| Instruction following score | 59.7 | – |
| Knowledge score | 70.7 | 57.2 |
| Long context score | 65.4 | – |
| Multimodal score | 69.7 | 53.2 |
| Reasoning score | 75.8 | 58.9 |
| Maths score | – | 48.3 |
| Blended price $/M | $20.00 | $1.56 |
| Output speed | 63 tok/s | – |
| Time to first answer | 81.4 s | – |
| Context window | 1M | 2M |
| SimpleBench | – | 56.0% |
| Remote Labor Index | 16.1% | – |
| APEX-Agents | 45.0% | – |
| FrontierCode | 53.5% | – |
| ProofBench | – | 4.0% |
| Epoch Capabilities Index | 163.4 | – |
| LMArena Text | 1506 | 1465 |
| LMArena Hard Prompts | 1532 | 1477 |
| LMArena Coding | 1552 | 1499 |
| LMArena WebDev | 1628 | 1240 |
| LMArena Vision | 1330 | 1199 |
| AA Intelligence Index | 49.7 | – |
| IFBench | 63.5% | – |
| AA-LCR | 82.3% | – |
| AA-Omniscience | 43.3 | – |
| Terminal-Bench Hard | 62.9% | – |
| GPQA Diamond (AA) | 92.6% | – |
| Humanity's Last Exam (AA) | 55.5% | – |
| SciCode (AA) | 61.0% | – |
| τ²-Bench Telecom (AA) | 98.5% | – |
| AIME (Vals) | – | 91.9% |
| LiveCodeBench | 89.8% | 80.6% |
| MMLU-Pro | 91.5% | 84.2% |
| LegalBench | 88.6% | 82.5% |
| CorpFin | 71.8% | 66.0% |
| TaxEval | 76.9% | 73.1% |
| MedQA | – | 92.1% |
| MGSM | – | 89.5% |
| Terminal-Bench 2.1 (Vals) | 80.5% | – |
| SWE-bench (Vals) | 95.0% | 41.4% |
| GPQA Diamond (Vals) | 93.2% | 84.3% |
| Vals Index | 66.0 | – |
| AIME 2026 | – | 94.2% |
| HMMT February 2026 | – | 86.4% |
| MathArena Apex | – | 5.2% |
| MCP Atlas | 83.3% | – |
| PRBench Finance | 53.9% | – |
| PRBench Legal | 52.6% | – |
| HiL-Bench | 56.3% | – |
| EQ-Bench 4 | 1340 | – |
| Kagi LLM Benchmark | 88.8% | – |
| 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 vs Grok 4.1: questions
- Is Claude Fable 5 better than Grok 4.1?
- Claude Fable 5 leads on quality: 68.8 vs 57.4. The BenchLeader Index combines every independent quality benchmark; Claude Fable 5 is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is Claude Fable 5 better than Grok 4.1 for coding?
- Claude Fable 5 scores higher in coding (69 vs 48 on the category index, where 50 is average).
- Is Claude Fable 5 better than Grok 4.1 for agentic tasks?
- Grok 4.1 scores higher in agentic tasks (78 vs 74 on the category index, where 50 is average).
- Which is cheaper, Claude Fable 5 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.