Hand off large migrations, complex implementations, and multi-day autonomous
sessions. ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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Built for your most ambitious work
Claude Fable 5, our next generation of intelligence, is once again available
in Claude Code.
It works more like a seasoned engineer: designed to investigate your codebase
before it acts, use relevant context as it works, and check its work before
reporting it’s done. It also excels at long-running, asynchronous work, so you
can hand it bigger tasks and let it run.
Through July 7, Claude Fable 5 is included in your subscription
<
https://support.claude.com/en/articles/15424964?utm_content=inline_link> and
draws from your plan’s usage, with no additional costs. You can use it for up
to 50% of your weekly usage limits. After that, you can keep using it with
usage credits.
Try it: Select Claude Fable 5 with /model. Available at $10 input / $50 output
per million tokens.
Read the blog
<
https://www.anthropic.com/news/redeploying-fable-5?utm_content=hero_cta>
How to get the most from Claude Fable 5
Give it the goal, not the steps
Describe the outcome and let Claude Fable 5 plan the path. Use it with /goal
to keep Claude working until a completion condition is met.
Size up asynchronous tasks and walk away
Hand it work you’d normally break up. It’s able to hold multi-hour and
multi-day sessions without losing the thread.
Skip the guardrail prompts
You don’t need to note things like “make sure to test.” Claude Fable 5 is
built to review its own work with less prompting. Qualitative feedback works
better than itemized instructions.
Hand it ambiguous problems
Root-causing, outage debugging, architecture calls. Claude Fable 5 can more
reliably identify underlying causes, instead of simply symptoms.
Need help picking the best model for your work? Review our model configuration
guide <
https://code.claude.com/docs/en/model-config?utm_content=inline_link> in
the Claude Code Docs.
Learn more
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https://www.anthropic.com/news/redeploying-fable-5?utm_content=secondary_cta>
How safeguards work
Claude Fable 5 shares the same underlying model as Claude Mythos 5, but with
additional safeguards, particularly in the cyber and bio domains. These
safeguards allow us to share this intelligence more broadly.
When a request touches a high-risk area like cybersecurity or biology, Claude
Fable 5 may route it to Claude Opus 4.8.
Inputs submitted to and outputs from Claude Fable 5 are retained for 30 days
to support our safety work. See ourhelp center
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learn more.
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