OpenAI’s GPT-6 Sol and Anthropic’s Claude Opus 5.2 are reportedly being gray-tested at the same time, although the article says publicly available test results remain limited. The reports about GPT-6 Sol rely mainly on its apparent knowledge cutoff: a model that recognizes Claude Opus 4.7, released on April 16, 2026, may be part of the gray rollout, while GPT-5.6 is described as having a February 16 cutoff. Early tests of Opus 5.2 reportedly show a substantial improvement over Opus 5 in rocket-launch animation, complex static SVG modeling, frontend work and 3D tasks. Some testers preferred its visual style to GPT-6 Astra’s, while others found Astra’s materials and lighting more three-dimensional and its SVG rendering of a PlayStation controller highly accurate. The article says Opus 5.2 appears to be available through Claude Code, whereas the web version is likely still serving Opus 5.0. It speculates that the naming and model information came from Microsoft code, and that OpenAI could release the GPT-6 family together, possibly during the week discussed in the article; these claims are not presented as confirmed announcements. The article also reports that OpenAI has announced GPT-5.5 will retire on October 14, and notes a late-September OpenAI DevDay where further announcements or Codex usage credits could appear.
