An unconfirmed GPT-5.6 with a reported 1.5M-token context is showing up in Codex logs.

Developers spotted a "gpt-5.6" routing string tied to codename iris-alpha, a reported 1.5M-token window (~43% over GPT-5.5), and cleaner one-shot UI generation, per TokenMix. OpenAI has announced nothing, and Polymarket prices roughly 80-89% odds of a release by June 30. Treat this as a rumor with an indirect evidence trail, not a launch. Worth noting only because it's the dominant speculation this week and a 1.5M context would matter for the long-horizon agent work everything else today is about.