Fable 5 Returns With 50% Plan Limits and a Safety Classifier That May Block Your Code
Fifty percent of weekly limits through July 7, then usage credits at API rates. A new classifier may silently redirect coding sessions to Opus 4.8.
Fable 5 returned to Claude.ai on July 1 after three weeks offline. Pro, Max, Team, and select Enterprise subscribers get access for up to 50% of their weekly plan limits through July 7 - after which Fable moves to usage credits billed at $10 per million input tokens and $50 per million output tokens. Seven days at half capacity, then API pricing.
A New Classifier Routes Flagged Prompts to Opus 4.8
Fable 5's return comes with a new safety layer. Anthropic trained an improved classifier to block the bypass behavior that Amazon reported before the government suspension - the company claims a 99% catch rate on the reported exploit.
Flagged requests route to Opus 4.8, not a hard block. Anthropic calls this the 'switch models' setting and enables it by default in Claude.ai; turning it off means the chat pauses instead of switching models. Developers who need Fable 5's specific capabilities get a quieter failure mode - the request succeeds, just not on the model they picked.
Anthropic itself flags the false positive risk. Per the official announcement, 'benign requests may be caught,' particularly 'during routine coding and debugging tasks.' A model that false-positives on debugging prompts will silently swap to Opus 4.8 mid-session without telling the user why.
Anthropic promises classifier improvements over time. For a model that had already frustrated users with over-cautious refusals on cybersecurity and biology topics before the ban, a classifier that silently downgrades coding sessions to Opus 4.8 may be the part of this return worth watching most closely.
Subscribers Expected Two Weeks of Full Access. They Got Three Days.
Three days. That's what subscribers got before Anthropic pulled Fable 5 on June 12, citing a US government directive over a reported jailbreak vulnerability, three days into a promised two-week, no-cap window. Now they get seven more days at half limit.
Anger on Reddit has been vocal. 'Not a good look to bring Fable back and then both half the usage and take away days,' one user wrote. Another: 'We got to use it for like 3 days out of the 14 we were told, and now we get it for just 7 days at half usage?'
Anthropic confirmed AWS, Google Cloud, and Microsoft Foundry will re-enable Fable 5 'as quickly as possible,' though no date appears in the announcement. Mythos 5 still covers only a select set of US organizations under the Glasswing program. Subscribers have five days left. Anthropic has announced no extension past July 7.