Slima MCP

Connect from ChatGPT

3 min read

ChatGPT has one extra step vs claude.ai: enable Developer Mode first.

Slima Authorized Apps: ChatGPT appears here after Developer Mode + Custom MCP connection

Prereqs

  • ChatGPT Plus or Pro (Free has no Custom MCP)
  • ChatGPT UI from 2025.10+ (when Developer Mode opened)

Steps

1 · Enable Developer Mode

  1. ChatGPT settings → Advanced
  2. Toggle Developer Mode on
  3. Reload

2 · Add Custom MCP Server

  1. Settings → Custom MCP servers
  2. "Add MCP server"
  3. Fill:
    • Name: Slima
    • Transport: HTTP / Streamable HTTP
    • URL: https://mcp.slima.ai/mcp
  4. "Save"

3 · OAuth authorize

First use:

  1. ChatGPT prompts "Authorize with Slima"
  2. Redirect to Slima sign-in
  3. Authorize
  4. Redirect back

Verify

In ChatGPT:

@slima list my books

Should return your books.

ChatGPT vs Claude.ai

claude.ai ChatGPT
Connection Custom Connector Custom MCP Server
Required tier Pro / Max / Team / Enterprise Plus / Pro
Developer Mode No Yes

Issues

No Custom MCP option

  1. ChatGPT version ≥ 2025.10
  2. Plus / Pro (Free doesn't have it)
  3. Developer Mode on

401 / connection fails

See: Can't connect

Related

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