Use ChatGPT (GPT-5.4) inside Freebuff with BYOK
Bring your own ChatGPT key for free, deeper reasoning passes.
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The Freebuff TeamBuilding the free coding agent
TL;DR
- Freebuff supports BYOK for OpenAI — use your ChatGPT account’s API key.
- The agent loop stays free; only token usage on your key counts.
- Best fit: deep architecture passes, hard debugging, security review.
When to BYOK ChatGPT#
- Hard architecture decisions where you want GPT-5.4 Pro’s extended reasoning.
- Security review of authentication or crypto code.
- Cross-paradigm refactors (e.g., callbacks → async/await across 40 files).
- Final pass before a critical PR.
Setup (90 seconds)#
# 1. Get a key at platform.openai.com
export OPENAI_API_KEY=sk-...
# 2. Start Freebuff
freebuff
# 3. Switch to GPT-5.4 in-session
/model gpt-5.4-mediumFreebuff keeps the agent loop, tool calls, and subagent orchestration free. You’re only paying OpenAI for the tokens the planner consumes.
Best workflow: free model for execution, BYOK for planning#
| Feature | Freebuff | BYOK-only setups (OpenCode, Aider) |
|---|---|---|
| Agent loop cost | Free | Paid (per call) |
| Plan with GPT-5.4 | $0.40 – $1.50 / hour active | Same |
| Execute with free models | Yes — DeepSeek V4 Pro free | No |
| Browser-use included | Yes | No |
| Subagents | 9 specialized | 1 |
Get ChatGPT in your CLI for free
Install Freebuff and bring your existing OpenAI key.
Install Freebuff