Where’s the best place to use DeepSeek-V4-Flash-0731 rn?

I’m mainly looking for the best free option, highest limits, best API/provider, and best coding/research setup. OpenRouter, official DeepSeek API, OpenCode, etc. - what are you guys actually using and what has the best limits/speed? Sorry if this is a basic question, I’ve never used DeepSeek before, especially through the API.