Claude Fable 5 vs Claude Opus 4.8
Head to head on 40 shared benchmarks, with price, context window, and release dates.
Benchmark scores
42evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Fable 5 Anthropic | 17.4% | 83.9% | 38.6% | 71.8% | 87.0% | 1340elo | 1943elo | 83 | 78.0% | 56.3% | 29.3% | 29.8% | 1932elo | 92.6% | 66.0% | 55.5% | 63.5% | 13.3% | 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% | 80.3% | 76.9% | 88.0% | 62.9% | 61.4% | 74.2% | 90.4% | 98.5% | - | - | 69.2% |
| Claude Opus 4.8 Anthropic | 15.5% | 80.4% | 14.5% | 66.7% | 62.0% | 1281elo | 1840elo | 80.8 | 40.0% | 53.9% | 13.4% | 22.5% | 1890elo | 92.0% | 56.9% | 48.7% | 62.2% | 10.4% | 80.1% | 79.3% | 78.3% | 67.4% | 81.4% | 84.3% | 89.7% | 53.2% | 85.8% | 69.9% | 83.4% | 69.0% | 54.8% | 53.5% | 69.2% | 75.6% | 82.7% | 58.3% | 55.1% | 70.9% | 82.7% | 94.4% | 47.2% | 91.8% | 63.1% |
2 / 2 models
| Attribute | Claude Fable 5 Anthropic | Claude Opus 4.8 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 4.8 (Adaptive Reasoning, Max Effort) is an AI model from Anthropic. |
| Family | Claude | Claude |
| Params | - | - |
| Open weights | closed | - |
| License | - | - |
| Released | 9 Jun 2026 | 28 May 2026 |
| Context | 1,000,000 | 1,000,000 |
| 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 | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image, file |
| 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 4.8 better?
- Across the 40 benchmarks both models report on Sophon, Claude Fable 5 leads on 35 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 4.8 compare on GPQA Diamond?
- Claude Fable 5 scores 92.6% and Claude Opus 4.8 scores 92.0% on GPQA Diamond.
- Which is cheaper, Claude Fable 5 or Claude Opus 4.8?
- Claude Opus 4.8 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 4.8 released?
- Claude Fable 5 was released 9 Jun 2026 by Anthropic. Claude Opus 4.8 was released 28 May 2026 by Anthropic.
Other head-to-heads
56Claude Opus 4.8 vs GPT-5.541 shared evalsClaude Fable 5 vs GPT-5.539 shared evalsClaude Opus 4.8 vs Gemini 3.1 Pro Preview38 shared evalsClaude Fable 5 vs Gemini 3.1 Pro Preview36 shared evalsClaude Opus 4.7 vs Claude Opus 4.830 shared evalsClaude Opus 4.8 vs Claude Sonnet 4.629 shared evalsClaude Opus 4.6 vs Claude Opus 4.828 shared evalsClaude Opus 4.8 vs GPT-5.428 shared evalsClaude Opus 4.8 vs Kimi K2.528 shared evalsClaude Fable 5 vs Claude Sonnet 4.628 shared evalsClaude Fable 5 vs Claude Opus 4.728 shared evalsClaude Opus 4.8 vs GLM 5.127 shared evalsClaude Opus 4.8 vs GPT-5.226 shared evalsClaude Opus 4.8 vs GPT-5.4 Mini26 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 Opus 4.8 vs Qwen3.6 Plus25 shared evalsClaude Fable 5 vs GLM 5.125 shared evalsClaude Fable 5 vs GPT-5.4 Mini25 shared evalsClaude Fable 5 vs Claude Sonnet 4.524 shared evalsClaude Opus 4.8 vs GPT-5 Mini24 shared evalsClaude Fable 5 vs GPT-5.224 shared evalsClaude Opus 4.5 vs Claude Opus 4.824 shared evalsClaude Opus 4.8 vs Grok 4.1 Fast24 shared evalsClaude Fable 5 vs Qwen3.6 Plus24 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 Opus 4.8 vs GPT-5 Nano22 shared evalsClaude 4 Sonnet vs Claude Opus 4.822 shared evalsClaude Opus 4.8 vs DeepSeek V3.222 shared evalsClaude 4 Sonnet vs Claude Fable 522 shared evalsClaude Fable 5 vs GPT-5 Nano21 shared evalsClaude Opus 4.8 vs GLM 4.721 shared evalsClaude Opus 4.8 vs Gemini 2.5 Pro20 shared evalsClaude Fable 5 vs DeepSeek V3.220 shared evalsClaude Fable 5 vs GLM 4.720 shared evalsClaude Opus 4.8 vs GPT-6 Astra19 shared evalsClaude Fable 5 vs Gemini 2.5 Pro19 shared evalsClaude Opus 4.8 vs gpt-oss-120b18 shared evalsClaude Fable 5 vs GPT-6 Astra18 shared evalsClaude Fable 5 vs gpt-oss-120b18 shared evalsClaude Opus 4.8 vs GPT-517 shared evalsClaude Fable 5 vs GPT-516 shared evalsClaude Opus 4.8 vs GPT-4o14 shared evalsClaude Fable 5 vs GPT-4o13 shared evalsClaude Opus 4.8 vs GPT-4o-mini12 shared evalsClaude Opus 4.8 vs GPT-4.1 Nano12 shared evalsClaude Fable 5 vs GPT-4o-mini12 shared evalsClaude Opus 4.8 vs GPT-4.1 Mini11 shared evalsClaude Opus 4.8 vs GPT-4.111 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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