Claude Fable 5 vs GPT-5 Nano
Head to head on 21 shared benchmarks, with price, context window, and release dates.
Benchmark scores
68evals · sort by any column, ⤢ to expand fullscreen
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| Claude Fable 5 Anthropic | 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% | 95.0% | 51.9% | 60.2% | 76.9% | 62.9% | 98.5% | - | - | 17.4% | - | 83.9% | - | 38.6% | - | 71.8% | 87.0% | - | 1340elo | 78.0% | 56.3% | - | 29.3% | - | - | 29.8% | 1932elo | - | 66.0% | 13.3% | - | - | - | - | - | - | - | - | - | 85.0% | - | - | - | 80.3% | 88.0% | - | 61.4% | 74.2% | - | - | 90.4% | - | - | - | 69.2% |
| GPT-5 Nano OpenAI | 705elo | 28 | 67.6% | 9.5% | 67.6% | 52.8% | 62.4% | 43.4% | 55.7% | 46.8% | 68.4% | 40.3% | 30.4% | 72.9% | 53.6% | 12.0% | 30.4% | 36.6% | 67.4% | 12.1% | 36.5% | 0.0% | 83.7% | - | 0.25 | - | 0.21 | - | 6.7% | - | - | 10.0% | - | - | - | 78.2% | - | 8.3% | 1.18 | - | - | 100.0% | - | - | 78.9% | 1.38 | 1.38 | 100.0% | 100.0% | 26.7% | 78.0% | 100.0% | 0.0% | - | 0.0% | 1.72 | 34.8% | - | - | 29.7% | - | - | 20.41 | -6.67 | - | 82.0% | 82.0% | 40.0% | 48.9% |
2 / 2 models
| Attribute | Claude Fable 5 Anthropic | GPT-5 Nano OpenAI |
|---|---|---|
| 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. | GPT-5 nano is an AI model from OpenAI. |
| Family | Claude | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | - | proprietary |
| Released | 9 Jun 2026 | 7 Aug 2025 |
| Context | 1,000,000 | 400,000 |
| Input $/1M | $10.00 | $0.05 |
| Output $/1M | $50.00 | $0.40 |
| Cache read $/1M | $1.000 | $0.005 |
| Cache write $/1M | $12.500 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image, file |
| Providers | - | - |
| Publisher | Anthropic | OpenAI |
| 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 GPT-5 Nano better?
- Across the 21 benchmarks both models report on Sophon, Claude Fable 5 leads on 20 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Fable 5 and GPT-5 Nano compare on GPQA Diamond?
- Claude Fable 5 scores 92.6% and GPT-5 Nano scores 67.6% on GPQA Diamond.
- Which is cheaper, Claude Fable 5 or GPT-5 Nano?
- GPT-5 Nano is cheaper at $0.40 per million output tokens against $50.00 for Claude Fable 5 - about 125.0x.
- When were Claude Fable 5 and GPT-5 Nano released?
- Claude Fable 5 was released 9 Jun 2026 by Anthropic. GPT-5 Nano was released 7 Aug 2025 by OpenAI.
Other head-to-heads
56Claude Fable 5 vs Claude Opus 4.840 shared evalsClaude Fable 5 vs GPT-5.539 shared evalsGPT-5 Mini vs GPT-5 Nano38 shared evalsClaude Fable 5 vs Gemini 3.1 Pro Preview36 shared evalsClaude Sonnet 4.5 vs GPT-5 Nano31 shared evalsGPT-5 vs GPT-5 Nano28 shared evalsClaude Fable 5 vs Claude Sonnet 4.628 shared evalsClaude Fable 5 vs Claude Opus 4.728 shared evalsGPT-4.1 Mini vs GPT-5 Nano26 shared evalsGPT-5 Nano vs GPT-5.226 shared evalsClaude Opus 4.5 vs GPT-5 Nano26 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 4 Sonnet vs GPT-5 Nano25 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 evalsGemini 2.5 Pro vs GPT-5 Nano24 shared evalsGPT-5 Nano vs Grok 4.1 Fast24 shared evalsClaude Fable 5 vs GPT-5.224 shared evalsClaude Fable 5 vs Qwen3.6 Plus24 shared evalsClaude Fable 5 vs GPT-5 Mini23 shared evalsGPT-5 Nano vs GPT-5.523 shared evalsClaude Opus 4.6 vs GPT-5 Nano23 shared evalsGLM 4.7 vs GPT-5 Nano23 shared evalsClaude Fable 5 vs Claude Opus 4.523 shared evalsClaude Fable 5 vs Grok 4.1 Fast23 shared evalsGemini 3.1 Pro Preview vs GPT-5 Nano22 shared evalsClaude Opus 4.8 vs GPT-5 Nano22 shared evalsGPT-5 Nano vs GPT-5.422 shared evalsGPT-5 Nano vs Kimi K2.522 shared evalsClaude Opus 4.7 vs GPT-5 Nano22 shared evalsDeepSeek V3.2 vs GPT-5 Nano22 shared evalsGPT-4.1 Nano vs GPT-5 Nano22 shared evalsGPT-5 Nano vs gpt-oss-120b22 shared evalsClaude 4 Sonnet vs Claude Fable 522 shared evalsGLM 5.1 vs GPT-5 Nano21 shared evalsGPT-4.1 vs GPT-5 Nano20 shared evalsClaude Sonnet 4.6 vs GPT-5 Nano20 shared evalsGPT-5.4 Mini vs GPT-5 Nano20 shared evalsClaude Fable 5 vs DeepSeek V3.220 shared evalsClaude Fable 5 vs GLM 4.720 shared evalsGPT-5 Nano vs Qwen3.6 Plus19 shared evalsClaude Fable 5 vs Gemini 2.5 Pro19 shared evalsGPT-4o vs GPT-5 Nano18 shared evalsClaude Fable 5 vs GPT-6 Astra18 shared evalsClaude Fable 5 vs gpt-oss-120b18 shared evalsClaude Fable 5 vs GPT-516 shared evalsGPT-4o-mini vs GPT-5 Nano16 shared evalsClaude Fable 5 vs GPT-4o13 shared evalsClaude Fable 5 vs GPT-4o-mini12 shared evalsClaude Fable 5 vs GPT-4.1 Nano11 shared evalsClaude Fable 5 vs GPT-4.1 Mini10 shared evalsGPT-5 Nano vs GPT-6 Astra10 shared evalsClaude Fable 5 vs GPT-4.110 shared evals
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