Claude Fable 5 vs GPT-5.5 Pro
Claude Fable 5 (Anthropic) and GPT-5.5 Pro (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-5.5 Pro leads on overall intelligence (ECI 161 vs 161).
- Claude Fable 5 is cheaper on input tokens — $10.00 vs $30.00 per 1M.
- GPT-5.5 Pro has a larger context window (1.1M vs 1M tokens).
| Attribute | Claude Fable 5 | GPT-5.5 Pro |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 161 | 161 |
| Coding | 99 | — |
| Math | 95 | 99 |
| Reasoning & Knowledge | 96 | 92 |
| Agentic & Tools | 98 | — |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Jun 9, 2026 | Apr 23, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 1.1M |
| Price — $/M input | $10.00 | $30.00 |
| Price — $/M output | $50.00 | $180.00 |
| Inputs | text, image, file | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 100% |
| APEX | 45% | — |
| GPQA Diamond | 93% | 94% |
| Humanity's Last Exam | 53% | — |
| SciCode | 60% | — |
| SimpleBench | 82% | 77% |
| SimpleQA Verified | 68% | 65% |
| WebDev Arena | 1654 | — |
| WeirdML | 92% | — |
| τ²-bench | 99% | — |
| ARC-AGI | — | 97% |
| ARC-AGI-2 | — | 85% |
| FrontierMath | — | 52% |
| FrontierMath Tier 4 | — | 40% |
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-5.5 Pro?
On Epoch AI's Capabilities Index, GPT-5.5 Pro scores higher (161) than Claude Fable 5 (161). 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-5.5 Pro?
Claude Fable 5 is cheaper on input tokens at $10.00 per million, versus $30.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Fable 5 or GPT-5.5 Pro?
GPT-5.5 Pro supports up to 1.1M tokens, compared with 1M for the other.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.