AI Models RadarAnthropic · 01 Sept 2026
Claude Fable 5.1
Anthropic’s Fable 5.1 update appears in Claude’s first-party release notes and model documentation.
High-signal launch with broad capability, access or platform-level implications.
Release is backed by the lab’s own announcement or newsroom post.
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Where Claude Fable 5.1 sits.
Model lifecycle
Know whether it is ready—and when it is leaving.
Radar tracks the model’s current access stage separately from its original announcement, including official retirement dates and recommended replacements when the lab publishes them.
Available through a public product or API channel.
- Status since
- 01 Sept 2026
Change Lens
What actually changed.
Normalized from the release note so different labs can be compared by the same fields, not just by launch copy.
Fable 5.1 is listed as the current Fable release in first-party Claude release notes and model documentation.
Evidence is first-party; comparison labels are normalized by Radar.
Release is backed by the lab’s own announcement or newsroom post.
Verified source · 3 receiptsSource receipts
Evidence behind the brief.
The Radar keeps claims traceable: first-party sources, normalized fields, unknowns and the latest verification marker used for this page.
Pricing, Context are not clearly specified in the indexed source note.
Updates the tracked Claude frontier tier with canonical release-note and model-doc evidence instead of relying on the older Fable 5 entry.
This brief links back to the first-party announcement or documentation used by the radar.
Open original source