Claude Fable 5 vs gpt-oss-120b
Head to head on 18 shared benchmarks, with price, context window, and release dates.
Benchmark scores
53evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Fable 5 Anthropic | 71.8% | 87.0% | 1943elo | 83 | 92.6% | 55.5% | 63.5% | 81.4% | 78.6% | 80.0% | 59.9% | 88.5% | 93.9% | 87.3% | 60.2% | 76.9% | 62.9% | 98.5% | - | - | 17.4% | - | - | 83.9% | 38.6% | 1340elo | 78.0% | 56.3% | 29.3% | 29.8% | 1932elo | - | 66.0% | 13.3% | - | - | - | 56.1% | 88.5% | - | - | 68.9% | 85.0% | 95.0% | 51.9% | - | - | 80.3% | 88.0% | - | 61.4% | 74.2% | 90.4% | 69.2% |
| gpt-oss-120b OpenAI | 58.2% | 11.0% | 961elo | 35.8 | 78.2% | 19.6% | 69.0% | 51.0% | 60.2% | 38.8% | 50.3% | 48.6% | 68.9% | 39.2% | 34.0% | 71.6% | 23.5% | 65.8% | 41.8% | 93.4% | - | 38.9% | 7.6% | - | - | - | - | - | - | - | - | 57.6 | - | - | 87.8% | 1.62 | 1.53 | - | - | 80.0% | 80.8% | - | - | - | - | 97.9% | 26.0% | - | - | 65.6% | - | - | - | 54.1% |
2 / 2 models
| Attribute | Claude Fable 5 Anthropic | gpt-oss-120b 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-Oss 120b is an AI model from OpenAI, released with open weights. |
| Family | Claude | GPT |
| Params | - | - |
| Open weights | closed | open |
| License | - | apache-2.0 |
| Released | 9 Jun 2026 | 5 Aug 2025 |
| Context | 1,000,000 | 131,072 |
| Input $/1M | $10.00 | $0.15 |
| Output $/1M | $50.00 | $0.59 |
| Cache read $/1M | $1.000 | $0.075 |
| Cache write $/1M | $12.500 | - |
| Speed | 0 tok/s | 194 tok/s |
| Latency | 0.00 s | 0.53 s |
| Modalities | text, image, file | text |
| Providers | - | - |
| Publisher | Anthropic | OpenAI |
| Reported scores | Finance Agent (v2)56.3% IFBench63.5% (AA) Swebenchpro80.3% LiveBench - Math93.9% (LiveBench) LiveBench - Coding78.6% (LiveBench) | GPQA Diamond78.2% (AA) Humanity's Last Exam (HLE)19.6% (AA) LiveCodeBench87.8% (AA) MMLU-Pro80.8% (AA) SciCode34.0% (AA) |
FAQ
- Is Claude Fable 5 or gpt-oss-120b better?
- Across the 18 benchmarks both models report on Sophon, Claude Fable 5 leads on 17 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Fable 5 and gpt-oss-120b compare on GPQA Diamond?
- Claude Fable 5 scores 92.6% and gpt-oss-120b scores 78.2% on GPQA Diamond.
- Which is cheaper, Claude Fable 5 or gpt-oss-120b?
- gpt-oss-120b is cheaper at $0.59 per million output tokens against $50.00 for Claude Fable 5 - about 84.0x.
- When were Claude Fable 5 and gpt-oss-120b released?
- Claude Fable 5 was released 9 Jun 2026 by Anthropic. gpt-oss-120b was released 5 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 evalsClaude Fable 5 vs Gemini 3.1 Pro Preview36 shared evalsClaude Fable 5 vs Claude Sonnet 4.628 shared evalsClaude Fable 5 vs Claude Opus 4.728 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 evalsGPT-5 Mini vs gpt-oss-120b25 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 Fable 5 vs GPT-5.224 shared evalsClaude Fable 5 vs Qwen3.6 Plus24 shared evalsClaude Sonnet 4.5 vs gpt-oss-120b23 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 evalsDeepSeek V3.2 vs gpt-oss-120b23 shared evalsGPT-5 Nano vs gpt-oss-120b22 shared evalsGPT-5.2 vs gpt-oss-120b22 shared evalsClaude 4 Sonnet vs Claude Fable 522 shared evalsClaude Fable 5 vs GPT-5 Nano21 shared evalsClaude Opus 4.5 vs gpt-oss-120b21 shared evalsClaude 4 Sonnet vs gpt-oss-120b21 shared evalsClaude Fable 5 vs DeepSeek V3.220 shared evalsClaude Fable 5 vs GLM 4.720 shared evalsgpt-oss-120b vs Grok 4.1 Fast20 shared evalsGLM 4.7 vs gpt-oss-120b20 shared evalsGPT-5.5 vs gpt-oss-120b19 shared evalsClaude Fable 5 vs Gemini 2.5 Pro19 shared evalsClaude Opus 4.6 vs gpt-oss-120b19 shared evalsgpt-oss-120b vs Kimi K2.519 shared evalsGLM 5.1 vs gpt-oss-120b19 shared evalsGemini 2.5 Pro vs gpt-oss-120b19 shared evalsGemini 3.1 Pro Preview vs gpt-oss-120b18 shared evalsClaude Opus 4.8 vs gpt-oss-120b18 shared evalsClaude Fable 5 vs GPT-6 Astra18 shared evalsGPT-5.4 vs gpt-oss-120b18 shared evalsClaude Sonnet 4.6 vs gpt-oss-120b18 shared evalsClaude Opus 4.7 vs gpt-oss-120b18 shared evalsGPT-5 vs gpt-oss-120b17 shared evalsGPT-4o vs gpt-oss-120b17 shared evalsGPT-5.4 Mini vs gpt-oss-120b17 shared evalsClaude Fable 5 vs GPT-516 shared evalsGPT-4.1 vs gpt-oss-120b16 shared evalsgpt-oss-120b vs Qwen3.6 Plus16 shared evalsGPT-4.1 Mini vs gpt-oss-120b15 shared evalsGPT-4o-mini vs gpt-oss-120b15 shared evalsGPT-4.1 Nano vs gpt-oss-120b14 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 evalsClaude Fable 5 vs GPT-4.110 shared evalsGPT-6 Astra vs gpt-oss-120b6 shared evals
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