Claude Fable 5 vs GPT-5 Pro
Claude Fable 5 (Anthropic) and GPT-5 Pro (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- Claude Fable 5 leads on overall intelligence (ECI 161 vs 150).
- Claude Fable 5 is cheaper on input tokens — $10.00 vs $15.00 per 1M.
- Claude Fable 5 has a larger context window (1M vs 400K tokens).
| Attribute | Claude Fable 5 | GPT-5 Pro |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 161 | 150 |
| Coding | 99 | — |
| Math | 95 | 71 |
| Reasoning & Knowledge | 96 | 54 |
| Agentic & Tools | 98 | — |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Jun 9, 2026 | Oct 7, 2025 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 400K |
| Price — $/M input | $10.00 | $15.00 |
| Price — $/M output | $50.00 | $120.00 |
| Inputs | text, image, file | image, text, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | — |
| APEX | 45% | — |
| GPQA Diamond | 93% | — |
| Humanity's Last Exam | 53% | 32% |
| SciCode | 60% | — |
| SimpleBench | 82% | 62% |
| SimpleQA Verified | 68% | — |
| WebDev Arena | 1654 | — |
| WeirdML | 92% | 60% |
| τ²-bench | 99% | — |
| ARC-AGI | — | 70% |
| ARC-AGI-2 | — | 18% |
| FrontierMath Tier 4 | — | 15% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Claude Fable 5 better than GPT-5 Pro?
On Epoch AI's Capabilities Index, Claude Fable 5 scores higher (161) than GPT-5 Pro (150). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Claude Fable 5 or GPT-5 Pro?
Claude Fable 5 is cheaper on input tokens at $10.00 per million, versus $15.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Fable 5 or GPT-5 Pro?
Claude Fable 5 supports up to 1M tokens, compared with 400K for the other.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.