Request for DeepSeek API Integration

[kexinoh]

I would like to request the addition of a DeepSeek API to your platform.

[teenmeem]

I also want this

[ZYMCao]

Same.
ChatOpenAI of langchain_openai does provide most API needed to use DeepSeek, however, token_counter of trim_messages does give me the error of "get_num_tokens_from_messages() is not presently implemented" which isnt.