# Fable Editorial

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Brand: claude.com
Category: product-launch

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## Email content

ClaudeThe Fable Dispatch · No. 5

Introducing Claude Fable 5

The model built for the hard part.

Fable 5 is our most capable widely released model — engineered for demanding reasoning and lng-horizon agentic work.

Claude Fable 5 launch — agentic reasoning at the frontierTry Claude

Long-horizon task checklist tracking multi-day progress

01 · LONG-HORIZON

Tasks that run for days, not minutes

Fable 5 sustains coherent state across long, asynchronous workflows — planning, executing, and self-correcting over hundreds of steps without losing the thread. Kick off complex multi-stage work and come back to a finished result.

02 · HARDEST CODE

The coding problems that used to stall

Hand Fable 5 a sprawling migration, a subtle concurrency bug, or a full-codebase refactor. It reasons across the whole repository, proposes a plan, and writes the diff — so you review a solution instead of debugging a guess.

Claude Code terminal analyzing a full codebase

Terminal showing a Claude Code snippet with deep codebase awareness

03 · SAFETY BUILT IN

Classifiers that ship with the model

Built-in safety classifiers run alongside every request, so the guardrails for agentic work come with the model rather than as a bolt-on. Deploy autonomous workflows with confidence — no separate moderation layer to wire up.

Build with Fable 5 today.

Available now in the API and across Claude. Point your agents at the hard problems and see how far they get.

Get API access

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Think fast, build faster.

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