Best GitHub & code hosting MCP server for ChatGPT (Codex), tested

Dated results

• DeepWiki MCP passed in ChatGPT (Codex) on 2026-10-22 (Codex CLI 0.162.0-alpha.17.2, mcp-remote 0.15.2, connect time not recorded). Full result
• GitMCP passed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, mcp-remote 0.15.1, connect time not recorded). Full result
• GitHub Repo MCP failed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, github-repo-mcp 1.0.3, connect time not recorded). Full result

Why DeepWiki MCP is the candidate

DeepWiki MCP passed every step in ChatGPT (Codex). It is the group’s site-wide candidate (judged 2026-10-22): Read the README of the public modelcontextprotocol/servers repo and returned its title in all 4 clients we test, with no token. GitMCP also passed all 4 but took 8 calls in Claude Code and Cursor versus DeepWiki's 3. GitHub Repo MCP (the earlier pick, 2 calls) passed twice in Claude Code and Cursor but failed in ChatGPT (Codex) on Oct 19, so by judging rule 1 it ranks below both. The official GitHub MCP server needs a personal access token, so it isn't tested and can't be picked. Confirmed Oct 22, 2026: second runs passed in all 4 clients (Claude Code, Cursor and ChatGPT (Codex) at ~1 PM ET, Claude Desktop at ~10:35 PM ET).

Provisional: based on one dated run per app (no repeat runs yet), so treat it as a candidate, not a final pick. How we test.

What failed or is partial in ChatGPT (Codex)

• GitHub Repo MCP: failed on 2026-10-19. Recorded reason: no successful call to this server's tools; answer missing ['Model Context Protocol servers']; no tool result containing ['Model Context Protocol servers']

Install in ChatGPT (Codex)

The exact snippet we tested is on the DeepWiki MCP page (pick the ChatGPT (Codex) tab). Not connecting? ChatGPT (Codex) MCP troubleshooting.

Not tested in ChatGPT (Codex) yet

GitHub MCP, GitLab MCP (zereight). Listed from their source; no result in ChatGPT (Codex) yet.

Questions

What is the best GitHub & code hosting MCP server for ChatGPT (Codex)?

In ToolPassed's hands-on tests in ChatGPT (Codex), DeepWiki MCP is our provisional candidate for GitHub & code hosting: it passed install, connect, tools and an agent task on 2026-10-22. We ran 3 GitHub & code hosting MCP servers in ChatGPT (Codex); 2 passed every step; not a pass: GitHub Repo MCP (failed).

Does DeepWiki MCP work with ChatGPT (Codex)?

DeepWiki MCP passed in ChatGPT (Codex) on 2026-10-22 (Codex CLI 0.162.0-alpha.17.2, mcp-remote 0.15.2, connect time not recorded).

Does GitHub Repo MCP work with ChatGPT (Codex)?

No, not in our test: GitHub Repo MCP failed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, github-repo-mcp 1.0.3, connect time not recorded). Recorded reason: no successful call to this server's tools; answer missing ['Model Context Protocol servers']; no tool result containing ['Model Context Protocol servers']