Will there be no next Fable model (5.2+) release by October 31, 2026?

ResolutionResolved YES

YES payout100¢

NO payout0¢

VenuePolymarket

Realized · held to resolution+56%$100 paper stake

Polymarket64¢ → 100¢

Our position · YES64¢ → 100¢

Signal endedNov 1

Forecast updated

Oct 26 forecast

YES: Q 75.8% · Market odds 73.3% at forecast

Official model list. Anthropic's newsroom and model list still show Claude Fable 5.1 as the newest Fable model.

Main caution: Partner access to a Fable 5.5 checkpoint could convert into a public launch before October 31.

Evidence and updates

Missed launch dates. Anthropic's anticipated October 20 and October 21 Fable 5.5 launches did not occur.

Cloud model IDs. Google Cloud's model table lists no Fable model at version 5.2 or higher.

Q updated; quotes are not comparable. Q +15.7 pts since the previous forecast, for YES.

The research packet changed.

Snapshot: 2026-10-26T09:10:13.047734+00:00 · 2026-10-26T09:04:00+00:00.

Ask Q: Does Anthropic publish any public model page, waitlist, or release-note entry naming a Fable model at version 5.2 or higher before November 1, 2026?

Official model list

A check completed on October 24, 2026 found that Anthropic's newsroom and model list did not include Claude Fable 5.5 and that the newest publicly usable Fable model was Claude Fable 5.1.

Missed launch dates

The anticipated October 20 and October 21 Claude Fable 5.5 launches did not occur.

Cloud model IDs

The October 21, 2026 Google Cloud API model-ID table listed Claude Fable 5.1 and Claude Fable 5, but no Fable version 5.2 or higher.

Main caution

The account imjustnewatai said Fable 5.5 was in staging and identified Tuesday, October 27, 2026 as its expected release date.
Frankie C. assessed on October 24, 2026 that Claude Fable 5.5 was close to release, based on an Azure catalog trace, an early-access codename, and reported partner access.

Points to YES

Anthropic's official newsroom and model list still name Claude Fable 5.1 as the newest publicly available Fable model.
A check completed on October 24, 2026 found no Claude Fable 5.5 in Anthropic's newsroom or model list, with Claude Fable 5.1 still the newest usable Fable model.
Two dates that trackers had circulated for a Fable 5.5 launch passed with no release from Anthropic.
The anticipated October 20 and October 21 Claude Fable 5.5 launches did not occur, according to an observation dated October 22, 2026.
Cloud provider model tables list the Fable line only at versions 5.1 and 5, with nothing at 5.2 or above.
The October 21, 2026 Google Cloud API model-ID table listed Claude Fable 5.1 and Claude Fable 5 but no Fable version 5.2 or higher.

Points to NO

Trackers describe a Fable 5.5 build in staging with partner access and point to October 27 as an expected public release date.
An account stated on October 21, 2026 that Fable 5.5 was in staging and named Tuesday, October 27, 2026 as the expected release date.
A Fable 5.5 identifier briefly appeared in an Azure models catalog before being pulled, showing internal preparation for a launch.
An Azure Models API entry for claude-fable-5-5 appeared on October 13, 2026 and was removed from LiteLLM on October 14 after vanishing from four checked Azure regions.

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