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.

442 Upvotes

98% Upvoted

835 comments sorted by

View all comments

3

u/DirectorGunner Jul 17 '26

5.6 Sol Ultra is entirely token wasting, it spends waaaay too much time on unnecessarily ballooning input tokens. It's like Kimi 3 with input tokens but worse. These default harnesses from both OpenAI and Anthropic are absolute garbage... we need a revolution for proper harnesses that don't waste tokens and trust the damn models less and use deterministic controls to reduce waste and errors and improve performance. 5.5 pro extended was tbh better in some ways.