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In practice, if you’re using both Anthropic and OpenAI models, how can you configure Pi (or any other harness) to use these native tools?

I’ve seen this before and the conclusion ends up being “use the native harness”, which I don’t think is an acceptable solution.

OpenCode checks model name and registers the appropriate tools.

const usePatch = model.modelID.includes("gpt-") && !model.modelID.includes("oss") && !model.modelID.includes("gpt-4")

Pi uses its own tools, like Armin wrote in the linked article.