[Enhancement]: Support for Assistants API OpenAI Reasoning Models in LibreChat

[firmai]

What features would you like to see added?

Support for Reason Models (e.g., o3, o1, etc.) with File Search on LibreChat. File Search referrring to the use of vector stores.

More details

LibreChat is expected to support OpenAI reasoning models (e.g., o3, o1, etc.) for file search—but currently encounters a problem. The file search checkbox is not clickable, and when interacted with, it produces the error message: "Illegal model request"

OpenAI assistants now work with reasoning models for file search. LibreChat should be updated to either not limit the models on the dropdown in assistants or enable reasoning models as the API currently allows.

LibreChat is the only interface that works smoothly with OpenAI agents, this addition would be very helpful and lead to a lot o people leaving the OpenAI plaground.

Which components are impacted by your request?

No response

Pictures

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[danny-avila]

See the documentation on this:

https://www.librechat.ai/docs/configuration/librechat_yaml/object_structure/assistants_endpoint#retrievalmodels

In your librechat.yaml:

endpoints:
  assistants:
    streamRate: 20
    retrievalModels:
      - "o3-mini-2025-01-31"
      # - add other models as needed

All this does is allow you to toggle File Search on/off from LibreChat. You still have to add files/vector-stores from OpenAI playground.

[danny-avila]

I'll update the default list soon but just pointing this out