Explore how OpenAI's GPT-5.6 family compares with Anthropic's Fable class across capabilities. Discover the strengths, trade-offs, and whether GPT-5.6 has taken the lead.

With OpenAI poised to deploy its latest frontier model as early as this week, Anthropic's extended promotion marks a calculated move to retain developer mindshare.

OpenAI's GPT-5.6 model family launches with US government oversight as senior researcher Noam Brown compares its capabilities to human research interns.