Head-to-head
Claude Fable 5.1 vs GPT-5.4 Pro
As of October 26, 2026, Claude Fable 5.1 leads GPT-5.4 Pro on the Analyzer Index, 94.8 to 81.8.
Normalized scores are min-maxed per benchmark across all models we track (0–100). Open the interactive compare view to add benchmarks to the radar chart or pull in more models.
Claude Fable 5.1
AnthropicGPT-5.4 Pro
OpenAI| At a glance | Claude Fable 5.1 | GPT-5.4 Pro |
|---|---|---|
| Analyzer Index | 94.8 (7/13) | 81.8 (5/13) |
| Blended price | $20.00/M | $33.75/M |
| Cheapest host | maker's API | maker's API |
| Context | 1.0M | 1.1M |
| Output speed | — | — |
| Time to first token | — | — |
| Benchmark | Claude Fable 5.1 | GPT-5.4 Pro |
|---|---|---|
Chatbot Arena Elo Arena | — | |
Rolling Contamination-Controlled Average Rolling Avg | — | |
Rolling Data Analysis Data Analysis | — | |
FrontierMath Tiers 1-3 FrontierMath | — | |
SimpleQA Verified SimpleQA | ||
OTIS Mock AIME 2024-2025 OTIS AIME | — | |
Humanity's Last Exam HLE | ||
ARC-AGI 2 ARC-AGI 2 | ||
Frontier Composite Frontier | ||
Output Stability Stability | — | |
Format Adherence Format | — | |
Recovery Rate Recovery | — | |
Safety Handling Safety | — |
Methodology matches the main AI Model Analyzer About page.