← the radar · ✳ model tracker
Mythos 5.5
watchingNot out yet. Anthropic hasn't released Mythos 5.5; the latest signal, on November 1, 2026: Anthropic's own Mythos page already says Claude Mythos 5.5. What we know so far: unreleased; Nov 1: Anthropic's own Mythos page (anthropic.com/claude/mythos) reads 'Claude Mythos 5.5' in its page header and wordmark alt text, read directly 15:3x UTC, while its body and pricing still describe Mythos 5.1; first flagged by @kimmonismus on a tip from @SergioOSINT; no announcement, date or price; no Mythos 5.5 id on OpenRouter or models.dev. Swept every 60 seconds across provider catalogs. The moment it answers on a public API, alerts fire: a text or a call on paid plans the second it's confirmed, then a free Chrome push and email about 15 minutes later.
An email when Mythos 5.5 answers on a public API, about 15 minutes after members, plus every frontier launch · no card
Timeline
Anthropic's own Mythos page now names Claude Mythos 5.5. The page header and the wordmark's alt text at anthropic.com/claude/mythos read "Claude Mythos 5.5", while everything below it, including availability and pricing, still describes Mythos 5.1. We read the page source directly on November 1 at about 15:30 UTC.
Current model in this line
Mythos 5.1, live since September 1, 2026.
The official word
We alert on verified API behavior, never on announcements alone — but when Anthropic speaks, it's here: anthropic.com/news ↗
Mythos 5.5: quick answers
Is Mythos 5.5 out yet?
Not yet. ArtificialWatch has not seen Mythos 5.5 answer on any public API it sweeps. The moment it does, subscribers get an alert.
Which model is current until Mythos 5.5 ships?
The current model in this line is Mythos 5.1 from Anthropic, live since September 1, 2026.
Who makes Mythos 5.5?
Anthropic. ArtificialWatch also tracks Claude Haiku 5.5, Claude Sonnet 5.5, Claude Opus 5.5, Fable 5.1, Mythos 5.1, Claude Opus 5, Fable 5 and Claude Sonnet 5 from Anthropic.
More from Anthropic
Cite this page
Writing about Mythos 5.5? Copy a link or a citation.
<a href="https://artificialwatch.com/model/mythos-5-5">Mythos 5.5 on ArtificialWatch</a>ArtificialWatch, "Mythos 5.5", https://artificialwatch.com/model/mythos-5-5Hear when Mythos 5.5 drops. Free.
Free: a Chrome push and an email about 15 minutes after it's confirmed on a public API. Members get a text or a phone call the second it lands.
- Free forever
- No card
- Unsubscribe in one click
Also: the wire · the bench index · our track record