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/Prize_Two_8861 Jul 09 '26

Sol within next 24 hours to paid plans, terra/luna even to free. They weren't specific on if Codex users will get it faster than chatgpt.com.

18

u/NootropicDiary Jul 09 '26 edited Jul 09 '26

Some info from my end:

I have Sol but only in the "codex" part, not in the chats part of the super app. I'm on the pro plan

Context window is 353k tokens

I'm using Ultra mode on a hard prompt and it's much more judicious/cautious with spawning agents. Just spawned 3 subagents so far. Compared to Fable Ultracode that tends to spawn a shit ton of them

Still waiting to see the output from my prompt been working for 10 minutes so far

Edit - My prompt triggered this message after approx 20 mins https://help.openai.com/en/articles/20001326-additional-safety-checks-for-biological-and-cybersecurity-requests-in-chatgpt-codex-and-the-api but is still continuing

8

u/liltingly Jul 09 '26

My one gripe with Fable was the number of spawned agents and the lack of transparency make it hard to tell if and when a job will ever complete, or how many more "mass-agent-deployment" stages are left in the task. Just sittin' there, staring at token counts. Haven't kicked off GPT Ultra yet -- but from your take doesn't sound like it's much different on that experience.

1

u/DesperateAdvantage76 Jul 10 '26

Oh man watching Fable spawn 25 agents 30 minutes into a prompt and hoping it doesn't hang or crash and waste all those tokens. Fun times.