Claude Fable 5.1 vs Gemini 3.1 Pro Preview
API pricing, context, and independently measured performance, side by side. Gemini 3.1 Pro Preview starts 80% 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
Providers4
Fastest measured—
VisionToolsReasoningStructured outputPrompt caching
Gemini 3.1 Pro Preview
Google · released Feb 19, 2026
Best input$2.00 / MTok
Best output$12.00 / MTok
Context1.05M
Providers6
Fastest measured2.6s° TTFT · 285 tok/s
VisionToolsReasoningStructured outputPrompt caching
Cheapest providers, measuredUSD / MTOK
| MODEL | PROVIDER | INPUT | OUTPUT | TTFT | TPS | SMOKE |
|---|---|---|---|---|---|---|
| Claude Fable 5.1 |  Google | $10.00 | $50.00 | — | — | — |
| Claude Fable 5.1 |  Amazon Bedrock | $10.00 | $50.00 | — | — | — |
| Claude Fable 5.1 |  Anthropic | $10.00 | $50.00 | — | — | — |
| Gemini 3.1 Pro Preview |  Google AI Studio | $1.00 | $6.00 | 3.3s° | 671° tok/s | — |
| Gemini 3.1 Pro Preview | Google | $1.00 | $6.00 | 2.6s° | 285° 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