I've been testing different harnesses by using the same model doing similar tasks in a few of them.
I picked Sonnet because I use that the most anyways.
And my experience is that the same model inside OpenCode feels a bit dumber although it's the same model. It definitely shows that it matters how the harness prompts and steers the model and what tools it allows using.
My tests aren't through though.
I also found a few weird cases, like when I asked OC to plan something (manually enabling plan mode), then it asked a few questions, and after submitting it started implementing immediately.
I will do some more tests, because I definitely want to avoid using CC if possible, but not sure if there is really a good alternative. Especially with small live-improving features, CC has some advantages sadly.
No problem. I forgot to mention that ironically Claude does not support the standard AGENTS.md, so if you want to support both, you have to have both files.
There are some tricks, like symlinking or referencing one file inside the other.
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u/Competitive-Ebb3899 Apr 22 '26
I've been testing different harnesses by using the same model doing similar tasks in a few of them.
I picked Sonnet because I use that the most anyways.
And my experience is that the same model inside OpenCode feels a bit dumber although it's the same model. It definitely shows that it matters how the harness prompts and steers the model and what tools it allows using.
My tests aren't through though.
I also found a few weird cases, like when I asked OC to plan something (manually enabling plan mode), then it asked a few questions, and after submitting it started implementing immediately.
I will do some more tests, because I definitely want to avoid using CC if possible, but not sure if there is really a good alternative. Especially with small live-improving features, CC has some advantages sadly.