What changed
OpenAI added GPT-6 Sol and GPT-6 Luna to ChatGPT Work and Codex as models separate from ChatGPT's Chat picker. Codex desktop preserves a manually selected model; model and reasoning-effort availability vary by plan and workspace policy.
Why it matters
The distribution change lets teams route agent work to new model families, but model identity and reasoning settings can now diverge between Chat and Work or Codex.
What to do
Record the selected model and reasoning level in task traces, confirm workspace policy visibility, and rerun one coding and one document workflow before changing team defaults.
Caveat
The release note documents availability but publishes no independent performance comparison. Access is plan- and workspace-dependent, so a visible launch does not imply uniform tenant availability.