Anthropic's Claude Fable 5.1 Cuts Cache-Read Pricing to $0.25 Per Million Tokens, Targeting Long-Running Agents

Fable 5.1 leads the FrontierSWE v2 benchmark by 24 points and slashes agentic costs up to 45% — a bet that the money in agents is in sustained workflows, not one-shot chats.

Anthropic is repositioning Claude around the part of the market that actually pays the bills: long-running professional agents. According to @marcopapa99, Fable 5.1 is being "sold as the long-running agent workhorse," with Anthropic "aiming straight at the professional workflow stack." That's a deliberate narrowing. Rather than chase the general-assistant crown, the company is optimizing for developers who run agents for hours against real codebases and back-office tasks.

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