Anthropic's Mythos page briefly named an unreleased Claude Mythos 5.5 before it was taken down
ArtificialWatch says hidden page text listed it around 15:30 UTC on Sunday and was gone by about 17:30; Anthropic has announced nothing, and a separate GPT-6.2 Astra string in OpenAI's Codex tools is also unconfirmed.
Why it matters
If the name is real it would point to another model tier from Anthropic soon after its IPO filing, but nothing beyond page text supports it. Strings on web pages and in code can precede launches, yet they can also be placeholders, so the item stays unconfirmed. Watch for an announcement, a model card or an API listing from Anthropic, and for any OpenAI comment on the GPT-6.2 Astra string.
Key facts
- Hidden page text named Claude Mythos 5.5
- Seen around 15:30 UTC on Sunday
- Gone by about 17:30 UTC
- No announcement from Anthropic
- GPT-6.2 Astra string in Codex tools also unconfirmed