Droid incompatible with Grok 4 BYOK due to reasoning_effort param

[alexhamidi]

Problem

Using BYOK with Grok 4.1 returns a 400 error:
Error: 400 "Model grok-4-1-fast-reasoning does not support parameter reasoningEffort."

here is the config.json entry that caused the error:

{
      "model": "grok-4-1-fast-reasoning",
      "id": "custom:Grok-4.1-0",
      "index": 0,
      "baseUrl": "https://api.x.ai/v1",
      "apiKey": "xai-****",
      "displayName": "Grok 4.1",
      "maxOutputTokens": 8192,
      "noImageSupport": false,
      "provider": "openai"
 }

x.ai removed support of reasoning_effort after Grok-3, but the parameter is sent by droid automatically, which is why this fails.

Solution (temporary)

added an https proxy that removes the parameter:
mitmproxy --mode reverse:https://api.x.ai -s remove_reasoning.py

# remove_reasoning.py

import json
from mitmproxy import http

def request(flow: http.HTTPFlow) -> None:
    if "application/json" in flow.request.headers.get("Content-Type", ""):
        try:
            data = json.loads(flow.request.get_text())
            
            if "reasoning" in data:
                del data["reasoning"]
            
            flow.request.text = json.dumps(data)
        except json.JSONDecodeError:
            pass

then update config.json: "baseUrl": "http://localhost:8080/v1"

Suggestion

A long term fix would involve adding an unsupportedParams or something similar to config.json (essentially the inverse of extraArgs) so that unsupported params don't lead to 400s

Thank you! :)