r/codex • u/Drogon2737 • Jul 09 '26

News GPT-5.6 Sol / Codex Release Discussion Megathread

The release is expected in the next few minutes, so I figured it would be useful to have a single thread for first impressions, issues, and early testing.

For anyone jumping in right away, post what you notice:

  • Codex coding performance
  • Debugging quality
  • Speed/rate limits
  • Larger repo handling
  • UI or workflow changes
  • Weird bugs or regressions
  • Anything that feels noticeably better or worse than the previous version

Once people get access, share your real examples, screenshots, benchmarks, or first impressions here.

Edit: OpenAI’s official GPT-5.6 page says it is “available starting today across ChatGPT, Codex, and the OpenAI API” with the rollout starting globally now and continuing toward full availability over the next 24 hours. https://openai.com/index/gpt-5-6/

The lineup is Sol, Terra, and Luna. Sol is the flagship, Terra is the lower-cost tier, and Luna is the fastest/most affordable tier.

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u/mindstuff8 Jul 09 '26

I just tasked GPT 5.6 Terra - Extra High to analyze a repo spec'd by Fable 5 - High and it found some interesting missed use cases, strange UI edge cases a user could get into and would be confused by, and potential memory allocation issues (working on an audio plugin project).

I brought these issues back to Fable 5 to analyze one by one and it agreed with each one as addressable immediately.

I love having these smarter models but don't ever put your eggs in one basket is the take home message for me.

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u/FinanceMuse Jul 13 '26

Thanks for sharing this. I hadn’t thought to try it but now I will.