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claude.com · product-launch
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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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