Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.
- By:
- Anthropic
- Input:
- Output:
- Context length:
- 1M
- Max output:
- 128K
- Published:
- 2026-09-02
Providers
Same model, different providers. Automatic routing picks the cheapest healthy one within the same quality tier.
| Provider | ||||
|---|---|---|---|---|
| amazon-bedrock | $10/1M tokens | $50/1M tokens | Read$1/1M tokensWrite 5m$12.5/1M tokensWrite 1h$20/1M tokens | 1M |
| 30% offLowestanthropic | $10$7/1M tokens | $50$35/1M tokens | Read$1$0.7/1M tokensWrite 5m$12.5$8.75/1M tokensWrite 1h$20$14/1M tokens | 1M |
Availability
24 hoursSuccess rate of the requests Amux actually sent to each provider. Client errors are excluded from the denominator — a malformed request isn't the provider's fault.
Throughput
24 hoursAverage output speed on streaming requests, in tokens per second (TPS).
Latency
24 hoursAverage time to first token (TTFT) on streaming requests — how long from sending a request to receiving its first token.
Activity
24 hoursToken usage and cost for this model over time, split by the provider that served each request.
Related models
More models from Anthropic