Claude Fable 5 vs Grok 4.20 Multi-Agent
Claude Fable 5 
Grok 4.20 Multi-Agent Verdict
- Claude Fable 5 (thinking) leads on quality: 70.8 vs 59.2.
- Claude Fable 5 (thinking) is stronger in agents & tools, composite, instruction following, knowledge, long context, reasoning.
- Grok 4.20 Multi-Agent is stronger in coding, 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 4.4× faster (304 vs 70 tokens per second).
| Metric | Claude Fable 5 (thinking) | Grok 4.20 Multi-Agent |
|---|---|---|
| BenchLeader Index | 70.8 | 59.2 |
| Agents & tools score | 74.1 | – |
| Composite score | 91.7 | – |
| Instruction following score | 63.0 | – |
| Knowledge score | 84.6 | – |
| Long context score | 67.6 | – |
| Reasoning score | 90.8 | 65.9 |
| Coding score | – | 65.5 |
| Human preference score | – | 67.0 |
| Maths score | – | 64.4 |
| Multimodal score | – | 60.4 |
| Blended price $/M | $20.00 | $1.56 |
| Output speed | 70 tok/s | 304 tok/s |
| Time to first answer | 135.7 s | 9.9 s |
| Context window | 1M | 1M |
| LMArena Text | – | 1470 |
| LMArena Hard Prompts | – | 1483 |
| LMArena Coding | – | 1508 |
| LMArena Vision | – | 1260 |
| AA Intelligence Index | 49.6 | – |
| 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% | – |
| Kagi LLM Benchmark | 91.4% | – |
| CritPt | 28.6% | – |
| GDPval (AA) | 54.8% | – |
| τ²-Bench Banking (AA) | 38.1% | – |
| Analyst Agent (AA) | 48.8% | – |
| LMArena Maths | – | 1453 |
| LMArena Creative Writing | – | 1448 |
| LMArena Instruction Following | – | 1443 |
| LMArena Multi-turn | – | 1473 |
| LMArena Longer Queries | – | 1457 |
| LMArena Search | – | 1205 |
Data as of 2026-09-21. Best configuration of each model; every score links to its source on the model pages.
Claude Fable 5 vs Grok 4.20 Multi-Agent: questions
- Is Claude Fable 5 better than Grok 4.20 Multi-Agent?
- Claude Fable 5 (thinking) leads on quality: 70.8 vs 59.2. The BenchLeader Index combines every independent quality benchmark; Claude Fable 5 (thinking) is ahead overall as of 2026-09-21, but check the category scores for your use.
- Which is cheaper, Claude Fable 5 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 or Grok 4.20 Multi-Agent?
- Grok 4.20 Multi-Agent streams faster: 304 against 70 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.