Claude Fable 5.2 Replaces Fable 5.1 — Same Slot, Same Band

November 10, 2026

Claude Fable 5.2 is Anthropic's latest Mythos-class model in the selector. It takes the seat Fable 5.1 held, on the same Apex 18× band. Existing Fable 5.1 conversations continue on 5.2 automatically. It still does not support zero data retention — using it is always an explicit pick.

What you can do

• Pick Claude Fable 5.2 from the model selector on any plan that could already reach Fable 5.1. It sits in Closed SOTA, where 5.1 sat. The Auto router will never route you to it.
• Keep working in an existing Fable 5.1 thread — the next turn runs on 5.2. You do not re-pin.
• Use the same long-horizon shape — adaptive thinking (always on), 1M context, 128K max output, and tools. Thinking runs at medium effort unless you pin Beast, which runs it at max.
• Hand it the work that runs for hours — agent sessions that stay on one goal, multistep research across many sources, and analysis carried all the way to a finished document, spreadsheet, or deck.
• Ask about anything through June 2026 without attaching a source. That is the date its knowledge is reliable through.

Where this shows up

You left a Fable 5.1 investigation open on Friday. Open it Monday and keep going — the picker now says Claude Fable 5.2, and the work continues in the same thread.

You have a market question that needs twenty sources read properly, not skimmed, and a written answer at the end. Pick Claude Fable 5.2 and let it work. It does not support zero data retention: inputs and outputs may be retained for safety review, so keep client-confidential material off this model.

You open a new chat and see the landing strip. It names Fable 5.2. Clicking it opens the picker on Closed SOTA, already on that row.

Try it

• Open the Fable 5.1 thread — the picker already says Claude Fable 5.2 — then: "Continue the investigation from where we left off. Write the finding, the evidence behind it, and the decision I should take into Monday's meeting."
• Pick Claude Fable 5.2, then: "Research this market across every source you can reach, then give me the deck for the board, not the notes."
• Pick Claude Fable 5.2, then: "Read the attached filings and the competitor set. Write the board memo: what changed, what it means for the deal, and whether we should proceed."

Heads up

• Not private. Fable 5.2 does not support zero data retention. Do not send client-confidential material, personal data, or anything you could not afford a third party to see.
• Removed from Auto and Swarm for the same reason as 5.1. Using it is always an explicit pick.
• Same band — Apex 18×. Fable 5.2 sits where 5.1 did. Your plan quota and token balance do not change.
• Fable 5.1 is retired. Sessions pinned to it roll forward to 5.2. Fable 5 pins, already rolling forward to 5.1, now land on 5.2 too. Historical usage rows stay billed as the model that ran them.
• No EU inference profile. EU Data Residency does not get a dedicated EU Fable 5.2 route; requests use the global Bedrock profile.