New model: Claude Fable 5.1 (Anthropic)

Anthropic released Claude Fable 5.1 on September 1, 2026, a multimodal model supporting text, image, and PDF inputs with a 1000k context window and 128k maximum output. The model is available under the identifiers claude-fable-5-1, anthropic/claude-fable-5-1, and microsoft/claude-fable-5-1, with no retirement date announced.

AN● Healthy Claude Fable 5.1 Anthropic · claude-fable-5-1 Released2026-09-01 Retiresno announced date claude-fabletext+image+pdf1000k context128k max out also matches: claude-fable-5-1 anthropic/claude-fable-5-1 microsoft/claude-fable-5-1 provider announcement → https://models.dev/anthropic/claude-fable-5-1 Does your code call Claude Fable 5.1? $ curl -fsSL https://llmstatus.ai/install.sh | bash Then mm status in any repo — it finds every model you use and flags the ones on a clock. No account, nothing uploaded. Get alerted before it retires → https://llmstatus.ai/sign-up