frontierAnthropic·Released 2026-09
Claude Fable 5.1
Anthropic's current Fable model, built for demanding reasoning and long-horizon agentic work.
Pricing verified October 20, 2026 · source
Key specifications
| Vendor | Anthropic |
| Tier | frontier |
| Context window | 1M tokens |
| Pricing | $10 / $50 per 1M tokens (input/output) |
| Released | 2026-09 |
| Categories | Text GenerationAdvanced ReasoningCode GenerationMultimodalEnterprise |
Note: Verified 2026-10-20: model page shows Status "Active (latest)", released September 1, 2026, $10 / $50 per MTok, 1M context, 128K max output, retirement not sooner than September 1, 2027.
Key features
- •Current Fable model, same price as Fable 5
- •Adaptive thinking (always on)
- •1M-token context window with 128K max output
- •Cache reads at $0.25 per 1M tokens
- •Available on the Claude API, Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS
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