Claude Fable 5.1 vs Claude Opus 5.5
API pricing, context, and independently measured performance, side by side. Claude Opus 5.5 starts 60% cheaper on input than Claude Fable 5.1 at list prices.
Claude Fable 5.1
Anthropic · released Sep 1, 2026
Best input$10.00 / MTok
Best output$50.00 / MTok
Context1M
Providers5
Fastest measured2.8s° TTFT · 61 tok/s
VisionToolsReasoningStructured outputPrompt caching
Claude Opus 5.5
Anthropic · released Sep 22, 2026
Best input$4.00 / MTok
Best output$20.00 / MTok
Context1M
Providers13
Fastest measured3.7s° TTFT · 216 tok/s
VisionToolsReasoningStructured outputPrompt caching
Cheapest providers, measuredUSD / MTOK
| MODEL | PROVIDER | INPUT | OUTPUT | TTFT | TPS | SMOKE |
|---|---|---|---|---|---|---|
| Claude Fable 5.1 |  Azure | $10.00 | $50.00 | 3.6s° | 58° tok/s | — |
| Claude Fable 5.1 |  Anthropic | $10.00 | $50.00 | 2.8s° | 61° tok/s | — |
| Claude Fable 5.1 |  Amazon Bedrock | $10.00 | $50.00 | — | — | — |
| Claude Opus 5.5 | Amazon Bedrock | $4.00 | $20.00 | — | — | — |
| Claude Opus 5.5 | Azure | $4.00 | $20.00 | 3.7s° | 216° tok/s | — |
| Claude Opus 5.5 |  Google | $4.00 | $20.00 | 3.9s° | 164° tok/s | — |
TTFT/TPS: ModelIndex-measured medians (P50, trailing 21d) · chat10k profile (~10K in / 200 out) · ° = measured via OpenRouter routing (adds a hop) · SMOKE: of 5 programmatic capability probes passed · methodology v1.1 — full details on each model page