OpenAI Node v2 with custom Base URL (SiliconFlow) returns 404 at runtime, while credential test succeeds; AI Agent and OpenAI Node v1.8 work

[cryozerolabs]

Bug Description

In a Docker-deployed n8n, using OpenAI Node v2 (Message a model) against SiliconFlow’s OpenAI-compatible API (https://api.siliconflow.cn/v1), the credential test succeeds but the node fails at runtime with:

The resource you are requesting could not be found
404 page not found

In the same environment, AI Agent → OpenAI Chat Model works, and rolling back to n8n 1.112.6 + OpenAI Node v1.8 (same docker-compose and credentials) also works. This looks like a regression specific to OpenAI Node v2 or its request path handling.

To Reproduce

1. Create OpenAI Credential:

• Base URL: https://api.siliconflow.cn/v1
• Fill in SiliconFlow OpenAI-compatible key
• Click Test → Connection tested successfully

2. Add node OpenAI → Message a model (OpenAI Node v2):

• Use the same credential
• Pick a valid model
• Simple prompt (e.g., “hello”)
• Execute

3. Observe error:

The resource you are requesting could not be found
404 page not found

4. Controls:

• AI Agent → OpenAI Chat Model with the same credential → works

• Separate Docker instance: n8n 1.112.6 + OpenAI Node v1.8 (Latest) with the same docker-compose & credentials → works

Expected behavior

With a successful credential test, OpenAI Node v2 should call SiliconFlow’s OpenAI-compatible API and return a normal response (parity with AI Agent and OpenAI Node v1.8).

Debug Info

Debug info

core

• n8nVersion: 1.118.2
• platform: docker (self-hosted)
• nodeJsVersion: 22.21.0
• nodeEnv: production
• database: sqlite
• executionMode: regular
• concurrency: -1
• license: community
• consumerId: unknown

storage

• success: all
• error: all
• progress: false
• manual: true
• binaryMode: memory

pruning

• enabled: true
• maxAge: 336 hours
• maxCount: 10000 executions

client

• userAgent: mozilla/5.0 (macintosh; intel mac os x 10_15_7) applewebkit/537.36 (khtml, like gecko) chrome/142.0.0.0 safari/537.36
• isTouchDevice: false

Generated at: 2025-11-08T15:51:30.269Z

Operating System

macOs

n8n Version

1.118.2

Node.js Version

22.21.0

Database

SQLite (default)

Execution mode

main (default)

Hosting

self hosted

[n8n-assistant]

Hey @cryozerolabs,

Thank you for reaching out! We’ve received your issue and are looking into it. To help us track this internally, we’ve created a Linear ticket with the reference: "GHC-5414".

We’ll keep you updated as we make progress, but if you have any additional details or context to share, feel free to add them here - it’s always helpful!

Thanks for your patience and for bringing this to our attention.

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For INTERNAL use only: GHC-5414