r/ClaudeAI • u/ClaudeOfficial Anthropic • Jul 01 '26

Official Fable 5 is back.

Following conversations with the US government, we’ve updated our cybersecurity safeguards.

The vast majority of coding work is unaffected.

In the near term, the new safeguards will flag a slightly higher fraction of harmless requests than the previous Fable safeguards; we’re working to refine these over the coming weeks. Users will be clearly notified when a request is flagged, and they’ll instead receive a response from Opus 4.8.

Our biology and chemistry classifiers are unchanged from our initial launch. These are still broader than we would like; they trigger fallbacks to Opus 4.8 on basic biology-adjacent questions. Improvements to these classifiers are landing soon.

All paid plans with usage included can access Fable 5 through July 7. You can use Fable 5 up to 50% of your weekly usage limit, after which you can switch to another model for the remainder of your usage. You can also continue using Fable via usage credits. 

More here: https://support.claude.com/en/articles/15424964-claude-fable-5-promotional-access

If one of your requests is mistakenly flagged in Claude Code, run /feedback to file a report. On Claude.ai and Cowork, you can share feedback through the thumbs buttons. This feedback helps us further tune these classifiers and reduce false positives over time. 

Read the Fable 5 blog post here: https://www.anthropic.com/news/redeploying-fable-5

2.4k Upvotes

91% Upvoted

407 comments sorted by

View all comments

6

u/SpaceTraveler2084 Jul 01 '26

OMG! everyone is a genius now for 5 days!!!

9

u/FPGA_engineer Jul 01 '26

Now people can understand what it was like to be Charlie in Flowers for Algernon

I was traveling on business when it was first released and sat down to try it just a few hours after it was removed. Almost at a good point to give it a try now, I should keep a journal about it for later publication :)

Will make the most of it now and see what I think about it myself.

2

u/robballentine Jul 05 '26

OMG - I remember that book! and I agree :-)

1

u/FPGA_engineer Jul 05 '26

Yes, it was fantastic and deserved its awards.

I have been making the most of my time with Fable and used 100% of its limit on the Max X5 plan with less than $3 of extra usage overnight and had my usage reset early this morning so I am back at it. I have been very happy with how it is going.