Anthropic Bumps Fable's Claude End-of-Life Date Again, Citing GPT-5.6 'Sol' as Fable/Mythos-Class

Simon Willison·low signal

In a short Jul 12 note, Willison flags that Anthropic pushed back the date Fable stops being available inside Claude — the stated reason being that OpenAI's GPT-5.6 'Sol' is a Fable/Mythos-class model. It's a specific new data point on an otherwise heavily-covered Fable storyline; low signal on its own.