Live drop
AnthropicDropped Sep 1, 202654 builds51 makers14 prompts
Stronger long-horizon agentic coding and multistep research with 75% cheaper cache reads.
About this release
Claude Fable 5.1 is the generally available successor to Claude Fable 5. It extends the prior model with improved performance on demanding reasoning, long-running agentic coding, multistep research, and document/spreadsheet/slide work while keeping the same base token pricing and adding significantly cheaper cache reads. It features refined safeguards that reduce false positives on benign requests.
Read the official Anthropic launch pageWorth opening first
Same brief, other models
All challenges →Challenge
Same brief across models — older takes on the left, newer on the right.
Challenge
Same brief across models — older takes on the left, newer on the right.
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