GPT-5.6 Sol missing from the Codex desktop model picker for a ChatGPT Pro account #36743

Summary

GPT-5.6 Sol is absent from the Model menu in the ChatGPT desktop app's Codex interface for an individual ChatGPT Pro account.

Environment

• ChatGPT desktop app: 26.727.51351
• macOS
• Codex local task
• ChatGPT plan: Pro
• Local Codex config: model = "gpt-5.6-sol", reasoning effort ultra

Steps to reproduce

1. Open a local Codex task in the ChatGPT desktop app.
2. Open the model selector.
3. Inspect the available GPT-5.6 models.

Actual behavior

The picker lists 5.6 Terra and 5.6 Luna, but not 5.6 Sol. It also shows 5.5 and 5.4 Mini.

Expected behavior

5.6 Sol should be listed and selectable for the same individual Pro account, particularly since the local configuration targets Sol.

Why this seems inconsistent

The current pricing documentation lists the GPT-5.6 family, including Sol, for Plus and says Pro includes Plus:
https://learn.chatgpt.com/docs/pricing

Ongoing feedback

I use Codex extensively alongside Claude in real development workflows and can provide ongoing, reproducible comparisons and bug reports. I would be interested in a structured feedback/beta arrangement. If OpenAI can provide an unrestricted or suitably high Codex usage allocation or credits for this work, I would be happy to report issues continuously through GitHub and share practical product feedback.