GPT-5.6 is a really good model, and quite cheap. I can finally replace GPT-5.3-Codex for my Tool Calling in n8n.
Here's my benchmark results for GPT-5.6:
https://aibenchy.com/?q=gpt-5.6
(the high reasoning variants are still running, uploading them soon too)
EDIT: The high variants are there too, enjoy the hamsters[0].
Interesting that Sol (low) did better than Sol (medium) in your benchmark (and is barely more expensive than Terra). I too have been using 5.3 codex as a cheap-but-good model and are switching to Terra (xhigh).
Yeah, for some reason the (low) versions do really well, like they think directly of the solution instead of going around all the edge-cases and getting lost in one of them.
Also for most, there doesn't seem to be a big difference between (medium) and (high).
Here's all 3 (medium), and GPT-5.5
It GPT-5.6 doesn't seem to be a lot smarter than 5.5, but it is faster, cheaper, more efficient and more consistent:
https://aibenchy.com/compare/openai-gpt-5-6-sol-medium/opena...