Prompt caching for Open Router

Feature request for product/service

API Keys

Describe the request

I would like good prompt caching specifically to be implemented for Open Router to seriously decrease costs on Open Router supported models. Right now, even using a much cheaper model such as Minimax M2 can result in higher or equal costs to larger modules on the Cursor platform because requests to Open Router through the OpenAI API format do not have prompt caching enabled, at least to my knowledge.

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