Claude Fable 5 vs Grok 4
Claude Fable 5 
Grok 4 Verdict
- Claude Fable 5 leads on quality: 70.2 vs 58.6.
- Claude Fable 5 is stronger in agents & tools, coding, composite, human preference, instruction following, knowledge, multimodal, reasoning.
- Grok 4 is stronger in long context, maths.
- Grok 4 is 13× cheaper ($1.56 vs $20.00 per 1M blended).
| Metric | Claude Fable 5 | Grok 4 |
|---|---|---|
| BenchLeader Index | 70.2 | 58.6 |
| Agents & tools score | 74.4 | 55.3 |
| Coding score | 68.7 | 61.2 |
| Composite score | 92.0 | 57.4 |
| Human preference score | 71.4 | 59.8 |
| Instruction following score | 62.9 | 62.4 |
| Knowledge score | 71.4 | 58.3 |
| Long context score | 67.7 | 69.0 |
| Multimodal score | 69.7 | 53.8 |
| Reasoning score | 75.8 | 58.3 |
| Maths score | – | 58.0 |
| Blended price $/M | $20.00 | $1.56 |
| Output speed | 66 tok/s | – |
| Time to first answer | 92.7 s | – |
| Context window | 1M | 256k |
| GPQA Diamond | – | 87.0% |
| OTIS Mock AIME | – | 84.0% |
| Terminal-Bench | – | 27.2% |
| SimpleBench | – | 60.5% |
| Fiction.LiveBench 120k | – | 96.9% |
| Cybench | – | 43.0% |
| Remote Labor Index | 16.1% | – |
| WeirdML | – | 45.7% |
| APEX-Agents | 45.0% | 15.2% |
| FrontierCode | 53.5% | – |
| Epoch Capabilities Index | 163.4 | 146.4 |
| LMArena Text | 1506 | 1411 |
| LMArena Hard Prompts | 1532 | 1420 |
| LMArena Coding | 1552 | 1435 |
| LMArena WebDev | 1628 | – |
| LMArena Vision | 1330 | 1210 |
| AA Intelligence Index | 49.7 | 22.5 |
| IFBench | 63.5% | 53.7% |
| AA-LCR | 82.3% | 68.0% |
| MMMU-Pro | – | 68.8% |
| AA-Omniscience | 43.3 | 2.1 |
| Terminal-Bench Hard | 62.9% | 37.9% |
| GPQA Diamond (AA) | 92.6% | 87.7% |
| Humanity's Last Exam (AA) | 55.5% | 26.7% |
| SciCode (AA) | 61.0% | – |
| τ²-Bench Telecom (AA) | 98.5% | 74.8% |
| AIME (Vals) | – | 90.6% |
| LiveCodeBench | 89.8% | 83.3% |
| MMLU-Pro | 91.5% | 85.3% |
| LegalBench | 88.6% | 83.2% |
| CorpFin | 71.8% | 66.0% |
| TaxEval | 76.9% | 65.1% |
| MedQA | – | 92.5% |
| MGSM | – | 90.9% |
| Terminal-Bench 2.1 (Vals) | 80.5% | – |
| SWE-bench (Vals) | 95.0% | 57.8% |
| GPQA Diamond (Vals) | 93.2% | 88.1% |
| Vals Index | 66.0 | – |
| IMO 2025 | – | 21.4% |
| MathArena Apex | – | 2.1% |
| 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% | 73.6% |
| IFEval (HELM) | – | 94.9% |
| Omni-MATH (HELM) | – | 60.3% |
| WildBench (HELM) | – | 79.7% |
| MMLU-Pro (HELM) | – | 85.1% |
| GPQA Diamond (HELM) | – | 72.6% |
| HELM Capabilities mean | – | 78.5% |
| Aider Polyglot | – | 79.6% |
| ARC-AGI-1 | – | 79.6% |
| ARC-AGI-2 | – | 29.4% |
| BFCL Overall | – | 63.0% |
Data as of 2026-09-12. Best configuration of each model; every score links to its source on the model pages.
Claude Fable 5 vs Grok 4: questions
- Is Claude Fable 5 better than Grok 4?
- Claude Fable 5 leads on quality: 70.2 vs 58.6. The BenchLeader Index combines every independent quality benchmark; Claude Fable 5 is ahead overall as of 2026-09-12, but check the category scores for your use.
- Is Claude Fable 5 better than Grok 4 for coding?
- Claude Fable 5 scores higher in coding (69 vs 61 on the category index, where 50 is average).
- Is Claude Fable 5 better than Grok 4 for agentic tasks?
- Claude Fable 5 scores higher in agentic tasks (74 vs 55 on the category index, where 50 is average).
- Which is cheaper, Claude Fable 5 or Grok 4?
- Grok 4 is cheaper: $1.56 against $20.00 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Claude Fable 5 accepts more context: 1M against 256k tokens.