Got Opus 5.5, GPT 6 Sol, Grok 4.7 over those last ~30 hours. AND also MiMo 2.6 which is maybe not the same league but also pretty impressive!
Long story short: You should use Opus 5.5. If you don't have a Claude sub, now may be the time to get one.
If you're stuck with the OpenAI sub, you're out of Claude usage, or you simply prefer OpenAI, you should still go with Astra, even though it's a bit harder to "wield" and get useful results out of.
GPT 6 Sol is good if you need to go farther (usage wise) than with Astra. But it IS simply a smarter 5.6 Sol. Which, I guess, was the goal.
It just seems bad because Opus 5.5 launched yesterday, too.
By the way, don't sleep on Luna! It's dirt cheap, even with max effort. Obviously not the model you should use for frontier coding work, but for very trivial tasks, or especially for non-coding tasks it may very well be the best choice. Because it's essentially infinite usage you get out of it.
Grok 4.7 is rather disappointing. Slow, inefficient, and doesn't feel that much smarter than 4.6. I'll still to 4.6 for now therefore. Well, actually I'll use Opus 5.5, but if I'm working with Grok, it'll be 4.6.
Hopefully 4.8 will be a step in the right direction then.
MiMo 2.6 is a Chinese (open weights) model that comes in "Pro" and "Flash" variants. I used the "Pro" one yesterday and found it really good.
To be honest: Not something I'll keep on using because I got my subscriptions with Claude etc.
BUT MiMo is incredibly cheap (I used it at API prices and only spent a few bucks) and pretty intelligent. The best open model right now. So give it a try if you got use-cases where you can't or don't want to use a subscription.
Be aware though, that MiMo 2.6 Pro at max effort is VERY slow and thinks A LOT.