Semafor reports that Mythos can now be released to select companies. Also:

The letter is silent on Fable 5, a weaker version of Mythos that was briefly the most powerful AI model widely available to consumers. People close to the talks said they are moving toward releasing Fable as well, though that timeline is unclear.

Presumably the company list is the same for both Mythos and GPT-5.6 announced today. Whether intended or not, the way this was handled has effectively pulled back Anthropic’s perceived lead by a couple weeks, perhaps aligning the latest frontier releases.