Presumably not, but the better approach is anyways to first plan using a powerful/expensive model like Opus, then you can use something less capable and cheaper

Presumably not, but the better approach is anyways to first plan using a powerful/expensive model like Opus, then you can use something less capable and cheaper for the coding part. This would be true even if you just want to use Anthropic models, but makes even more sense if you want to use something cheaper like Qwen3.5 or Kimi K2.5 for the coding part.