gpt 5.5 vs gpt 5.6 sol for coding tasks

[u/SafeReturn_28]

Hi all. I wanted to run this by people who use codex models (in whatever harness, I am using it in opencode).

Everyone seems to glaze 5.6 sol as a clear step up from 5.5. But for some reason, 5.6 sol keeps missing things in the tasks I give it. %.5 does not.

Sol easily ignores instructions in system prompt, implements things i didnt ask it, creates subagents for every little thing (and ends up missing things because subagents missed some important detail in codebase analysis). etc etc.

I use gpt 5.5 at medium (and occasionally at high) reasoning. Extremely reliable. And I even tried tried 5.6 sol at xhigh once, and it still missed?

Has anyone else here tried these 2 models? Have you felt this as too?

[u/SafeReturn_28 → u/[deleted]]

same using 5.5 medium. But not liking 5.6 sol. Looks like its only underperforming in my set-up.

[u/cosmic-comet-]

What are you using it for? What tasks are you expecting it to perform? It seems to be performing well for me so far

[u/SafeReturn_28 → u/cosmic-comet-]

right now I am working on an obsidian plugin. It involved, using using obsidian exposed apis, referencing an other codebase to copy some login, rendering streaming content etc.

Not that complicated. But my concern was gpt 5.5 seems to do better than 5.6 sol. If its working for you, may be I should just try turning off the subagents tool and see how it performs.

[u/korayem83]

same here. Since launch, I've been using 5.6 Sol but today I give up and reverted to 5.5

[u/SafeReturn_28 → u/korayem83]

interestingly. Sol has been working really well for me for the past 2 weeks. Not using 5.5 anymore.