Claude Fable 5 vs GPT-5.4 Pro
Claude Fable 5 (Anthropic) and GPT-5.4 Pro (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- Claude Fable 5 leads on overall intelligence (ECI 163 vs 159).
- Claude Fable 5 is cheaper on input tokens — $10.00 vs $30.00 per 1M.
- GPT-5.4 Pro has a larger context window (1.1M vs 1M tokens).
| Attribute | Claude Fable 5 | GPT-5.4 Pro |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 163 | 159 |
| Coding | 96 | — |
| Math | 96 | 96 |
| Reasoning & Knowledge | 89 | 76 |
| Agentic & Tools | 96 | — |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Jun 9, 2026 | Mar 5, 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 | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | — |
| APEX | 45% | — |
| ARC-AGI | 99% | 95% |
| ARC-AGI-2 | 89% | 83% |
| GPQA Diamond | 86% | 95% |
| Humanity's Last Exam | 56% | 44% |
| SciCode | 61% | — |
| SimpleBench | 82% | 74% |
| SimpleQA Verified | 71% | 46% |
| WebDev Arena | 1626 | — |
| WeirdML | 92% | 57% |
| τ²-bench | 99% | — |
| FrontierMath | — | 50% |
| FrontierMath Tier 4 | — | 38% |
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-5.4 Pro?
On Epoch AI's Capabilities Index, Claude Fable 5 scores higher (163) than GPT-5.4 Pro (159). 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-5.4 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-5.4 Pro?
GPT-5.4 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.