Head-to-head
Claude Fable 5.1 vs GPT-5.5
As of October 25, 2026, Claude Fable 5.1 leads GPT-5.5 on the Analyzer Index, 93.7 to 91.2.
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-5.5
OpenAI| At a glance | Claude Fable 5.1 | GPT-5.5 |
|---|---|---|
| Analyzer Index | 93.7 (6/13) | 91.2 (7/13) |
| Blended price | $20.00/M | $5.63/M |
| Cheapest host | maker's API | maker's API |
| Context | 1.0M | 400k |
| Output speed | — | 104 tok/s |
| Time to first token | — | 2.23 s |
| Benchmark | Claude Fable 5.1 | GPT-5.5 |
|---|---|---|
Chatbot Arena Elo Arena | ||
Output Speed Speed | — | |
Time to First Token TTFT | — | |
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 | ||
Terminal-Bench 2 TermBench 2 | — | |
Frontier Composite Frontier | ||
Output Stability Stability | ||
Format Adherence Format | ||
Recovery Rate Recovery | ||
API Success Rate API OK | — | |
Safety Handling Safety |
Methodology matches the main AI Model Analyzer About page.