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I think that's what happens when you try to use a model that's no longer supported. You'll need to change to another model in the AI provider configuration.
BTW, we're close to releasing the first beta of Wing 12 that introduces AI agent based development, starting with Claude Codec. It is way better than the one-off queries that Wing 11 supports. That will still be possible but from my experiences with this, I suspect most people will use agents instead.