Claude Fable 5.1 vs GPT-6 Astra
API pricing, context, and independently measured performance, side by side.
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
GPT-6 Astra
OpenAI · released Sep 4, 2026
Best input$10.00 / MTok
Best output$50.00 / MTok
Context1.05M
Providers5
Fastest measured4.3s° TTFT · 187 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 | — | — | — |
| Claude Fable 5.1 |  Anthropic | $10.00 | $50.00 | — | — | — |
| Claude Fable 5.1 |  Amazon Bedrock | $10.00 | $50.00 | — | — | — |
| GPT-6 Astra |  OpenAI | $5.00 | $25.00 | — | — | — |
| GPT-6 Astra | Azure | $10.00 | $50.00 | 4.3s° | 187° 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