[Bug]: xAI Grok 4.5 compatibility: HTTP 400 despite valid OpenAI-compatible API

[lagan1]

Affected Component

External Integrations (LLM/Search APIs)

Describe the bug

Hi,

I'm trying to use PentAGI with xAI Grok 4.5.

Configuration:

OPEN_AI_SERVER_URL=https://api.x.ai/v1

with a valid xAI API key.

I tried both:

OpenAI provider
Custom provider

Creating a flow always fails with:

failed to create flow worker:
failed to get flow provider:
failed to select primary docker image via llm call:
API returned unexpected status code: 400

Steps to Reproduce

1. Configure an OpenAI-compatible provider with:
   OPEN_AI_SERVER_URL=https://api.x.ai/v1
   A valid xAI API key with access to grok-4.5.

2. Select the configured provider.

3. Create a new flow.

4. Observe that flow creation fails with:

failed to create flow worker:
failed to get flow provider:
failed to select primary docker image via llm call:
API returned unexpected status code: 400

I got the same error when i created the custom provider too

System Configuration

PentAGI Version:
Latest (Docker image: vxcontrol/pentagi:latest)

Deployment Type:
Docker Compose

Environment:

• Docker Version: 29.7.0
• Docker Compose Version: v5.3.1
• Host OS: Ubuntu 24.04 LTS
• Available Resources:
  • RAM: 8 GB
  • CPU: 4
  • Disk Space: 93GB

Enabled Features:
Custom LLM Server

Active Integrations:

• LLM Provider: OpenAI, Custom

Logs and Artifacts

I verified the following:

GET /v1/models works from inside the PentAGI container.
POST /v1/chat/completions with model: grok-4.5 works.
POST /v1/responses with model: grok-4.5 works.

Since the endpoint, authentication, and model all work, it looks like PentAGI may be sending one or more OpenAI-specific request parameters that xAI rejects

Screenshots or Recordings

No response

Verification

• I have checked that this issue hasn't been already reported
• I have provided all relevant configuration files (with sensitive data removed)
• I have included relevant logs and error messages
• I am running the latest version of PentAGI

[lagan1]

closing it, found the solution