Head-to-head
Claude Fable 5 vs Claude Sonnet 5.5
As of October 25, 2026, Claude Fable 5 leads Claude Sonnet 5.5 on the Analyzer Index, 93.0 to 86.7.
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
AnthropicClaude Sonnet 5.5
Anthropic| At a glance | Claude Fable 5 | Claude Sonnet 5.5 |
|---|---|---|
| Analyzer Index | 93.0 (5/13) | 86.7 (5/13) |
| Blended price | $20.00/M | $4.00/M |
| Cheapest host | maker's API | maker's API |
| Context | 1.0M | 1.0M |
| Output speed | — | 101 tok/s |
| Time to first token | — | 1.06 s |
| Benchmark | Claude Fable 5 | Claude Sonnet 5.5 |
|---|---|---|
Chatbot Arena Elo Arena | ||
Output Speed Speed | — | |
Time to First Token TTFT | — | |
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 | — | |
API Success Rate API OK | — | |
Safety Handling Safety | — |
Methodology matches the main AI Model Analyzer About page.