I created a Prompt that uses my custom MCP server. I set reasoning to high. I then started a conversation on the platform site and it worked very well. It calls my MCP server, I see the calls on my side, and it uses the information in the response. I even used my MCP server successfully in Deep Rese…

Maybe this has something to do with it. [image] Fix for vscode/cursor plugin: stream error: exceeded retry limit, last status: 401 Unauthorized Coding with ChatGPT I had the same issue and it fixed it for me as well.

@dankantor I noticed the exact same thing. MCP server working from the playground but not with the api. Did you find a fix for that ? Thanks

@dankantor I had it fixed by adding the tool again to the request from my code : body = {…body, tools: [{type: "mcp",server_label: "SERVER_LABEL",server_description: "SERVER_DESCRIPTION",server_url: "SERVER_URL",require_approval: "never",authorization: "TOKEN"}]} const stream = await this.openai.re…

Using an MCP server with Responses api gives a 500

API Bugs

Nic_T3744 September 20, 2025, 6:02am 2

Maybe this has something to do with it.

Topic		Replies	Views
Error using MCP Server using Open AI API / Playground Bugs gpt-4 , chatgpt , api	3	1494	August 4, 2025
Custom MCP tools doesnt work with gpt-5.1 model Bugs tools , responses , mcp , responses-api	5	465	November 19, 2025
Issue when try to use any of MCP servers or connectors in Agent Builder Bugs mcp , agent-builder	25	3597	January 4, 2026
MCP Server breaking when running with json_schema in response Bugs api , response_format , mcp	0	867	June 13, 2025
Playground Bug - MCP Server URL Gets Redacted When Saving Prompt in Playground API playground , mcp	12	799	December 4, 2025

Using an MCP server with Responses api gives a 500

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