Claude Fable 5.1 vs GLM 5.3
API pricing, context, and independently measured performance, side by side. GLM 5.3 starts 88% 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
GLM 5.3
Z.ai · released Aug 18, 2026
Best input$1.17 / MTok
Best output$3.96 / MTok
Context1.31M
Providers24
Fastest measured0.86s° TTFT · 52 tok/s
Open weightsToolsReasoningStructured 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 | — | — | — |
| GLM 5.3 | AKAkashML | $1.17 | $3.96 | — | — | — |
| GLM 5.3 | INIo Net | $1.19 | $4.18 | — | — | — |
| GLM 5.3 |  DeepInfra | $1.20 | $4.00 | — | — | — |