Gptcc

GPT for Claude Code

   

**Run OpenAI GPT models inside [Claude Code](https://claude.com/claude-code).** Same CLI, same conversation history, same plugins and skills. Works with your existing **ChatGPT Plus/Pro subscription** via the public OAuth flow — no OpenAI API key required, no separate terminal tab, no context switching.

npm install -g gptcc
gptcc setup
gptcc hello        # end-to-end test in 5 seconds

ℹ️ About this project

gptcc is an **extension** for Claude Code, not a replacement or a fork. It uses only documented extension points — `ANTHROPIC_BASE_URL`, `ANTHROPIC_CUSTOM_MODEL_OPTION`, plugin hooks — the same mechanisms Claude Code's own docs show for LiteLLM, LM Studio, Ollama, and vLLM. **No binary modification. No reverse engineering.**

The ChatGPT OAuth flow is the exact public flow used by OpenAI's open-source [Codex CLI](https://github.com/openai/codex), which OpenAI explicitly supports for personal, non-commercial use.

MIT licensed. Zero telemetry, zero tracking, zero monetization. Not affiliated with Anthropic or OpenAI. If either party would like this project to wind down, see [SECURITY.md](./SECURITY.md) — we'll comply within 24 hours, no escalation.

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Two ways to use it

Once installed, two workflows are available. You can switch between them any time — they're not mutually exclusive.

Mode 1 — GPT only

Drive the whole Claude Code session with a GPT model instead of Claude. Useful when you want GPT's behavior but still in the CLI and workflow you already have configured.