← the radar · ✳ model tracker
Fable 5.5
watchingUnannounced · Opus and Sonnet both went 5 -> 5.5 (Sep 22, Sep 28); on Oct 1 users on X reported claude.ai routing to a 'Fable 5.5' (unconfirmed, no id in any catalog). Swept every 60 seconds across provider catalogs. The moment it answers on a public API, alerts fire: a free Chrome push the second it's confirmed, a free email about 15 minutes later, texts or a call on paid plans.
Current model in this line
Fable 5.1, live since September 1, 2026 · $10 / $50 per 1M tokens on Anthropic's API · AW Index 95.8.
The official word
We alert on verified API behavior, never on announcements alone — but when Anthropic speaks, it's here: anthropic.com/news ↗
Fable 5.5: quick answers
Is Fable 5.5 out yet?
Not yet. ArtificialWatch has not seen Fable 5.5 answer on any public API it sweeps. The moment it does, subscribers get an alert.
Which model is current until Fable 5.5 ships?
The current model in this line is Fable 5.1 from Anthropic, live since September 1, 2026.
Who makes Fable 5.5?
Anthropic. ArtificialWatch also tracks Claude Sonnet 5.5, Claude Opus 5.5, Fable 5.1, Mythos 5.1, Claude Opus 5, Fable 5, Claude Sonnet 5 and Mythos 5 from Anthropic.
More from Anthropic
Hear the minute Fable 5.5 drops. Free.
A free Chrome push the second it's confirmed on a public API, email about 15 minutes later. Texts or a phone call on paid plans.
- Free forever
- No card
- Unsubscribe in one click
Also: the wire · the bench index · our track record