Claude Fable 5 vs Claude Opus 4.5
Head to head on 23 shared benchmarks, with price, context window, and release dates.
Benchmark scores
58evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Claude Fable 5 Anthropic | 71.8% | 1933elo | 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% | 95.0% | 51.9% | 60.2% | 76.9% | 62.9% | 90.4% | 98.5% | - | 17.4% | 83.9% | 38.6% | - | 90.0% | - | - | 1340elo | 78.0% | 56.3% | 29.3% | - | 29.8% | 1932elo | - | - | 66.0% | - | - | 13.3% | - | - | - | - | 85.0% | - | - | - | - | 80.3% | - | 88.0% | 66.0% | 74.2% | 69.4% |
| Claude Opus 4.5 Anthropic | 61.3% | 1683elo | 73.1 | 81.0% | 13.2% | 43.0% | 78.1% | 79.7% | 74.4% | 62.5% | 81.3% | 90.4% | 80.1% | 45.2% | 83.2% | 68.7% | 36.0% | 45.0% | 47.0% | 74.3% | 40.9% | 20.6% | 86.3% | 62.7% | - | - | - | 16.7% | - | 35.6% | 6.1% | - | - | - | - | 20.7% | - | - | 84.7% | 12.13 | - | 83.8% | 83.5% | - | 73.8% | 88.9% | 100.0% | 37.4 | - | 77.5% | 45.3 | 70.7% | 79.2% | - | 61.8 | - | - | - | 62.2% |
2 / 2 models
| Attribute | Claude Fable 5 Anthropic | Claude Opus 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. | Claude Opus 4.5 is an AI model from Anthropic. |
| Family | Claude | Claude |
| Params | - | - |
| Open weights | closed | closed |
| License | - | proprietary |
| Released | 9 Jun 2026 | 24 Nov 2025 |
| Context | 1,000,000 | 200,000 |
| Input $/1M | $10.00 | $5.00 |
| Output $/1M | $50.00 | $25.00 |
| Cache read $/1M | $1.000 | $0.500 |
| Cache write $/1M | $12.500 | $6.250 |
| Speed | 66 tok/s | 0 tok/s |
| Latency | 49.62 s | 0.00 s |
| Modalities | text, image, file | file, image, text |
| Providers | - | - |
| Publisher | Anthropic | Anthropic |
| Reported scores | Finance Agent (v2)56.3% IFBench63.5% (AA) Swebenchpro80.3% LiveBench - Math93.9% (LiveBench) LiveBench - Coding78.6% (LiveBench) |
FAQ
- Is Claude Fable 5 or Claude Opus 4.5 better?
- Across the 23 benchmarks both models report on Sophon, Claude Fable 5 leads on 21 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Fable 5 and Claude Opus 4.5 compare on GPQA Diamond?
- Claude Fable 5 scores 92.6% and Claude Opus 4.5 scores 81.0% on GPQA Diamond.
- Which is cheaper, Claude Fable 5 or Claude Opus 4.5?
- Claude Opus 4.5 is cheaper at $25.00 per million output tokens against $50.00 for Claude Fable 5 - about 2.0x.
- When were Claude Fable 5 and Claude Opus 4.5 released?
- Claude Fable 5 was released 9 Jun 2026 by Anthropic. Claude Opus 4.5 was released 24 Nov 2025 by Anthropic.
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