Never use a Harness if it is not opensourced.
DeepSeek Harness is my favorite for coding. Hermes is my favourite for Other things , followed by OpenCode (sucks at managing long running services) .
Others swear by Pi.dev
Z.ai are temporarily offering unlimited usage during off-peak hours with their harness, which is a pretty good deal if your project is public even with this news.
Or https://maki.sh :)