Claude Fable 5.1 vs Grok 4.20 Multi-Agent
Claude Fable 5.1 
Grok 4.20 Multi-Agent Verdict
- Claude Fable 5.1 (high) leads on quality: 71.9 vs 59.2.
- Claude Fable 5.1 (high) is stronger in agents & tools, coding, composite, knowledge, long context, reasoning.
- Grok 4.20 Multi-Agent is stronger in human preference, maths, multimodal.
- Grok 4.20 Multi-Agent is 13× cheaper ($1.56 vs $20.00 per 1M blended).
- Grok 4.20 Multi-Agent streams 5.4× faster (304 vs 57 tokens per second).
| Metric | Claude Fable 5.1 (high) | Grok 4.20 Multi-Agent |
|---|---|---|
| BenchLeader Index | 71.9 | 59.2 |
| Agents & tools score | 66.6 | – |
| Coding score | 74.1 | 65.5 |
| Composite score | 93.6 | – |
| Knowledge score | 83.4 | – |
| Long context score | 68.3 | – |
| Reasoning score | 81.0 | 65.9 |
| Human preference score | – | 67.0 |
| Maths score | – | 64.4 |
| Multimodal score | – | 60.4 |
| Blended price $/M | $20.00 | $1.56 |
| Output speed | 57 tok/s | 304 tok/s |
| Time to first answer | 26.2 s | 9.9 s |
| Context window | 1M | 1M |
| Terminal-Bench | 54.5% | – |
| SciCode | 57.6% | – |
| WeirdML | 92.3% | – |
| APEX-Agents | 44.4% | – |
| LMArena Text | – | 1470 |
| LMArena Hard Prompts | – | 1483 |
| LMArena Coding | – | 1508 |
| LMArena Vision | – | 1260 |
| AA Intelligence Index | 51.1 | – |
| AA-LCR | 83.7% | – |
| AA-Omniscience | 40.8 | – |
| GPQA Diamond (AA) | 90.6% | – |
| Humanity's Last Exam (AA) | 55.9% | – |
| SciCode (AA) | 58.7% | – |
| ARC-AGI-1 | 96.0% | – |
| ARC-AGI-2 | 88.8% | – |
| CritPt | 30.3% | – |
| GDPval (AA) | 55.9% | – |
| τ²-Bench Banking (AA) | 43.1% | – |
| LMArena Maths | – | 1453 |
| LMArena Creative Writing | – | 1448 |
| LMArena Instruction Following | – | 1443 |
| LMArena Multi-turn | – | 1473 |
| LMArena Longer Queries | – | 1457 |
| LMArena Search | – | 1205 |
| MirrorCode | 73.3% | – |
| CursorBench | 69.4% | – |
| ALE-Bench | 2143.2 | – |
Data as of 2026-09-21. Best configuration of each model; every score links to its source on the model pages.
Claude Fable 5.1 vs Grok 4.20 Multi-Agent: questions
- Is Claude Fable 5.1 better than Grok 4.20 Multi-Agent?
- Claude Fable 5.1 (high) leads on quality: 71.9 vs 59.2. The BenchLeader Index combines every independent quality benchmark; Claude Fable 5.1 (high) is ahead overall as of 2026-09-21, but check the category scores for your use.
- Is Claude Fable 5.1 better than Grok 4.20 Multi-Agent for coding?
- Claude Fable 5.1 scores higher in coding (74 vs 66 on the category index, where 50 is average).
- Which is cheaper, Claude Fable 5.1 or Grok 4.20 Multi-Agent?
- Grok 4.20 Multi-Agent is cheaper: $1.56 against $20.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Fable 5.1 or Grok 4.20 Multi-Agent?
- Grok 4.20 Multi-Agent streams faster: 304 against 57 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.