Claude Fable 5 vs Claude Sonnet 4.5
Claude Fable 5 Verdict
- Claude Fable 5 leads on quality: 68.8 vs 57.9.
- Claude Fable 5 is stronger in agents & tools, coding, composite, human preference, instruction following, knowledge, long context, multimodal, reasoning.
- Claude Sonnet 4.5 (high) is 3.3× cheaper ($6.00 vs $20.00 per 1M blended).
- Claude Fable 5 streams 1.6× faster (63 vs 40 tokens per second).
| Metric | Claude Fable 5 | Claude Sonnet 4.5 (high) |
|---|---|---|
| BenchLeader Index | 68.8 | 57.9 |
| Agents & tools score | 73.6 | – |
| Coding score | 68.7 | 56.4 |
| Composite score | 84.1 | – |
| Human preference score | 71.4 | 65.3 |
| Instruction following score | 59.7 | – |
| Knowledge score | 70.7 | – |
| Long context score | 65.4 | – |
| Multimodal score | 69.7 | – |
| Reasoning score | 75.8 | 66.4 |
| Blended price $/M | $20.00 | $6.00 |
| Output speed | 63 tok/s | 40 tok/s |
| Time to first answer | 81.4 s | 1.2 s |
| Context window | 1M | 1M |
| Remote Labor Index | 16.1% | – |
| APEX-Agents | 45.0% | – |
| FrontierCode | 53.5% | – |
| Epoch Capabilities Index | 163.4 | – |
| LMArena Text | 1506 | 1456 |
| LMArena Hard Prompts | 1532 | 1487 |
| LMArena Coding | 1552 | 1520 |
| LMArena WebDev | 1628 | 1393 |
| LMArena Vision | 1330 | – |
| 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% | – |
| LiveCodeBench | 89.8% | – |
| MMLU-Pro | 91.5% | – |
| LegalBench | 88.6% | – |
| CorpFin | 71.8% | – |
| TaxEval | 76.9% | – |
| Terminal-Bench 2.1 (Vals) | 80.5% | – |
| SWE-bench (Vals) | 95.0% | – |
| GPQA Diamond (Vals) | 93.2% | – |
| Vals Index | 66.0 | – |
| 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% | – |
| SWE-bench Verified (bash only) | – | 71.4% |
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 Claude Sonnet 4.5: questions
- Is Claude Fable 5 better than Claude Sonnet 4.5?
- Claude Fable 5 leads on quality: 68.8 vs 57.9. 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 Claude Sonnet 4.5 for coding?
- Claude Fable 5 scores higher in coding (69 vs 56 on the category index, where 50 is average).
- Which is cheaper, Claude Fable 5 or Claude Sonnet 4.5?
- Claude Sonnet 4.5 is cheaper: $6.00 against $20.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Fable 5 or Claude Sonnet 4.5?
- Claude Fable 5 streams faster: 63 against 40 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.