Anthropic · OpenAI · Claude · Mythos · Codex · GPT · Decrypt
Anthropic filed for an IPO, its first sale of shares to the public, on October 26
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Anthropic launched Fable 5 on June 9, pulled it offline for 18 days under U.S. export controls, which are government limits on who may use a technology, and released Fable 5.1 on September 1.
Key facts
- Anthropic filed for an IPO, its first sale of shares to the public, on October 26, reporting $16.29 billion in revenue for the first half of 2026 against $1.16 billion a year earlier
- Two Prompts: 4 lines Time: 2 Hours Tokens: 27 Miliion Thinking Effort: Max pic.twitter.com/6Uy9qxQV7e
- On October 13, an automated update to LiteLLM, an open-source tool developers use to connect to many AI providers, added an entry named “claude-fable-5-5” after Microsoft’s Azure cloud catalog listed
- Codex is OpenAI’s coding assistant, and a screenshot circulating on X showed gpt-6.2-astra at 19.8% of one account’s usage, next to gpt-6-astra at 80%
Summary
Users on X say some Claude Opus 5.5 requests are being routed to an unreleased model they call Fable 5.5, but Anthropic has not announced it and its Mythos page still lists version 5.1. A “Mythos 5.5” label appeared in the hidden code of Anthropic’s Mythos page on November 1, and a “claude-fable-5-5” entry was added to the LiteLLM catalog on October 13 with specs copied from Fable 5.1. OpenAI’s “gpt-6.2-astra” appeared in Codex usage data for some accounts on November 1, while Anthropic’s IPO roadshow cannot start before November 10. Users on X say Anthropic is quietly testing an unreleased version of Mythos and Fable, and OpenAI is about to launch GPT 6.2 Astra. Nobody has confirmed anything but the rumors are based on a handful of showcase demos, plus a catalog entry and a hidden website label that were both removed soon after appearing.