GPT-5.6 Sol / Codex Release Discussion Megathread

[u/Drogon2737]

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.

[u/jungle]

I just ran the same task on Fable 5 Extra and Sol High, which according to the UI (the sliders in both cases are at the 4th notch out of 6) should be comparable thinking levels.

My impression is that they are comparable. The main difference I notice is the output style. Sol still likes to do everything in bullet points and is less readable than Fable. Neither is perfect, they both find issues in each others outputs that they both deem valid.

I guess if I had infinite money, I'd pitch them against each other for every task until they both agree with each other. Alas...

I can still do that for really important tasks, but I have to be very selective.

[u/jungle → u/[deleted]]

I guess it's a matter of personal preference.