I run my OpenClaw on whatever is the latest GLM model and ever since the release of GLM 5 it has been a smooth ride. The models solve whatever problem I throw at them and the code is good enough that I barely ever have to look at it (to guide the mode). The 5.3 release seems particularly strong, I asked if to audit all the scripts that the previous versions have written and it identified some issues and hard to find bugs.

At work, as an experiment, I used GPT 5.6 Luna + Deepseek 4 Flash for a week (I have an unlimited, "within reason", budget at work so normally I just use Fable and Sol) and it's been perfectly fine.

These models take a bit longer (more turns) to solve problems so they feel a bit slower but the end result is often just as good or nearly as good. Because they're so cheap you can easily run multiple sessions in parallel so it doesn't really matter that they're slower.

I've done a few experiments where I've split my terminal in 4, launched 4 clients (each with a different model, including Fable and GPT 5.6 Sol) and compared the output. For simple and medium complexity work open-weight models are incredible effective.

I can highly recommend the 10 USD/month OpenCode Go subscription. It offers pretty amazing value for the money and is a great way to experiment.