Claude Fable 5 vs Claude Sonnet 4.5
Head to head on 24 shared benchmarks, with price, context window, and release dates.
Benchmark scores
98evals · sort by any column, ⤢ to expand fullscreen
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| Claude Fable 5 Anthropic | 71.8% | 1943elo | 83 | 92.6% | 55.5% | 63.5% | 81.4% | 78.6% | 80.0% | 59.9% | 88.5% | 93.9% | 87.3% | 56.1% | 88.5% | 68.9% | 85.0% | 95.0% | 51.9% | 60.2% | 76.9% | 62.9% | 90.4% | 98.5% | - | - | - | - | - | - | - | 17.4% | - | 83.9% | 38.6% | - | - | - | 87.0% | - | - | 1340elo | 78.0% | - | - | 56.3% | 29.3% | - | - | 29.8% | 1932elo | - | - | - | - | - | 66.0% | - | - | - | - | 13.3% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 80.3% | - | - | - | - | 88.0% | - | 61.4% | 74.2% | - | - | 69.2% |
| Claude Sonnet 4.5 Anthropic | 60.8% | 1678elo | 71.4 | 83.4% | 17.8% | 57.3% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 40.6% | 84.5% | 64.0% | 62.9% | 19.0% | 32.9% | 45.7% | 73.3% | 35.6% | 22.6% | 78.1% | 0.0% | 0.0% | 88.0% | 100 | 0.0% | 0.0% | 0.0% | - | 5.0% | - | - | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | - | - | 0.0% | 0.0% | - | - | 15.2% | 0.0% | - | - | 0.0% | 83.9% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 87.5% | 83.8% | - | 0.0% | 0.0% | 71.4% | 0.75 | 0.75 | 0.0% | 0 | 0 | 87.5% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0 | 0.0% | 0.0% | 77.2% | 67.0% | 74.8% | - | 0.0% | 0 | 0 | 50.34 | - | 0 | - | - | 0.0% | 1.49 | 29.2% |
2 / 2 models
| Attribute | Claude Fable 5 Anthropic | Claude Sonnet 4.5 Anthropic |
|---|---|---|
| Description | Claude Fable 5 is Anthropic's most capable widely released model, built for the most demanding reasoning and long-horizon agentic work. Shares its base model with the invitation-only Claude Mythos 5. | anthropic/claude-sonnet-4.5 is an AI model. |
| Family | Claude | Claude |
| Params | - | Undisclosed (closed) |
| Open weights | closed | closed |
| License | - | proprietary |
| Released | 9 Jun 2026 | 29 Sep 2025 |
| Context | 1,000,000 | 1,000,000 |
| Input $/1M | $10.00 | $3.00 |
| Output $/1M | $50.00 | $15.00 |
| Cache read $/1M | $1.000 | $0.300 |
| Cache write $/1M | $12.500 | $3.750 |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image, file |
| Providers | - | anthropic, aws-bedrock, vertex-ai |
| Publisher | Anthropic | Anthropic |
| Reported scores | Finance Agent (v2)56.3% IFBench63.5% (AA) Swebenchpro80.3% LiveBench - Math93.9% (LiveBench) LiveBench - Coding78.6% (LiveBench) | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) |
FAQ
- Is Claude Fable 5 or Claude Sonnet 4.5 better?
- Across the 24 benchmarks both models report on Sophon, Claude Fable 5 leads on 23 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Fable 5 and Claude Sonnet 4.5 compare on GPQA Diamond?
- Claude Fable 5 scores 92.6% and Claude Sonnet 4.5 scores 83.4% on GPQA Diamond.
- Which is cheaper, Claude Fable 5 or Claude Sonnet 4.5?
- Claude Sonnet 4.5 is cheaper at $15.00 per million output tokens against $50.00 for Claude Fable 5 - about 3.3x.
- When were Claude Fable 5 and Claude Sonnet 4.5 released?
- Claude Fable 5 was released 9 Jun 2026 by Anthropic. Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic.
Other head-to-heads
56Claude Fable 5 vs Claude Opus 4.840 shared evalsClaude Fable 5 vs GPT-5.539 shared evalsClaude Fable 5 vs Gemini 3.1 Pro Preview36 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Mini35 shared evalsClaude Opus 4.5 vs Claude Sonnet 4.534 shared evalsClaude Sonnet 4.5 vs GPT-5.232 shared evalsClaude Sonnet 4.5 vs GPT-5 Mini31 shared evalsClaude Sonnet 4.5 vs GPT-531 shared evalsClaude Sonnet 4.5 vs GPT-5 Nano31 shared evalsClaude 4 Sonnet vs Claude Sonnet 4.528 shared evalsClaude Opus 4.6 vs Claude Sonnet 4.528 shared evalsClaude Sonnet 4.5 vs Kimi K2.528 shared evalsClaude Sonnet 4.5 vs Grok 4.1 Fast28 shared evalsClaude Fable 5 vs Claude Sonnet 4.628 shared evalsClaude Fable 5 vs Claude Opus 4.728 shared evalsClaude Sonnet 4.5 vs Gemini 3.1 Pro Preview27 shared evalsClaude Sonnet 4.5 vs DeepSeek V3.227 shared evalsClaude Sonnet 4.5 vs GPT-5.526 shared evalsClaude Sonnet 4.5 vs GPT-5.426 shared evalsClaude Sonnet 4.5 vs Gemini 2.5 Pro26 shared evalsClaude Fable 5 vs Claude Opus 4.626 shared evalsClaude Fable 5 vs GPT-5.426 shared evalsClaude Fable 5 vs Kimi K2.526 shared evalsClaude Opus 4.8 vs Claude Sonnet 4.525 shared evalsClaude Sonnet 4.5 vs GLM 4.725 shared evalsClaude Fable 5 vs GLM 5.125 shared evalsClaude Fable 5 vs GPT-5.4 Mini25 shared evalsClaude Sonnet 4.5 vs Claude Sonnet 4.624 shared evalsClaude Opus 4.7 vs Claude Sonnet 4.524 shared evalsClaude Fable 5 vs GPT-5.224 shared evalsClaude Fable 5 vs Qwen3.6 Plus24 shared evalsClaude Sonnet 4.5 vs GLM 5.123 shared evalsClaude Sonnet 4.5 vs gpt-oss-120b23 shared evalsClaude Sonnet 4.5 vs GPT-5.4 Mini23 shared evalsClaude Fable 5 vs GPT-5 Mini23 shared evalsClaude Fable 5 vs Claude Opus 4.523 shared evalsClaude Fable 5 vs Grok 4.1 Fast23 shared evalsClaude Sonnet 4.5 vs Qwen3.6 Plus22 shared evalsClaude 4 Sonnet vs Claude Fable 522 shared evalsClaude Sonnet 4.5 vs GPT-4o21 shared evalsClaude Fable 5 vs GPT-5 Nano21 shared evalsClaude Fable 5 vs DeepSeek V3.220 shared evalsClaude Fable 5 vs GLM 4.720 shared evalsClaude Sonnet 4.5 vs GPT-4.119 shared evalsClaude Fable 5 vs Gemini 2.5 Pro19 shared evalsClaude Fable 5 vs GPT-6 Astra18 shared evalsClaude Fable 5 vs gpt-oss-120b18 shared evalsClaude Sonnet 4.5 vs GPT-4o-mini17 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Nano16 shared evalsClaude Fable 5 vs GPT-516 shared evalsClaude Fable 5 vs GPT-4o13 shared evalsClaude Fable 5 vs GPT-4o-mini12 shared evalsClaude Sonnet 4.5 vs GPT-6 Astra11 shared evalsClaude Fable 5 vs GPT-4.1 Nano11 shared evalsClaude Fable 5 vs GPT-4.1 Mini10 shared evalsClaude Fable 5 vs GPT-4.110 shared evals
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