🚨 Not just Mythos 5.5. Fable 5.5 already hit Azure.
→ "Mythos 5.5" appears 6× in the HTML (hidden h1 + logo alt text). The visible text still says 5.1
→ Oct 13: claude-fable-5-5 added to LiteLLM's Azure price list
→ Oct 14: removed, "Azure does not list"
→ MLflow's Azure model list still has it (1M ctx, $10/$50, the same as 5.1)
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Mythos 5.5 is already listed HTML source code of Anthropic's official website
Thanks to the anonymous person who sent me the tip via email :)