AI Coding for PMs: $20/Month Plan Beats $200 Setup in Bug Fixing
PawelHuryn · x · 2026-08-03
The author shares a 4-step guide for non-technical Product Managers to set up ChatGPT's Codex without using a terminal or IDE.
Core Workflow
- Open project folders directly in the ChatGPT desktop app and review visual diffs in the UI.
- Crucial Setting: Manually set reasoning effort to 'max' to unlock the model's full potential.
- Multi-Agent Synergy: Create an AGENTS.md file pointing to CLAUDE.md at the repo root to maintain a single source of truth across both OpenAI and Anthropic agents.
Benchmark & Cost Analysis
- Tested 10 frontier models against a custom benchmark of 105 hidden bugs.
- GPT-5.6 Luna (at max effort) fixed 33 bugs for just $1.80, whereas Anthropic's Fable 5 fixed 29 bugs for $104.
- Conclusion: Following OpenAI's 80% price cut for Luna, the $20 ChatGPT subscription provides roughly $500 worth of API credits, outperforming Claude's $200 plan for real-world tasks.
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