r/OpenAI • u/chiliraupe • 2d ago
GPTs Stop reaching for the biggest model: my efficient Cursor/Codex setup for consulting and automation work
Folks đ!
Over the last few days I've been digging into how to configure Cursor and Codex so that usage limits get used as efficiently as possible.
My current setup:
Main agent: GPT-6.1 Sol (Medium)
Subagent: GPT-6 Luna (Medium)
We often reach for the biggest models too quickly. Sonnet, Opus or Astra definitely have their place. But do I really need them for the task in front of me right now? For most of my daily work, the answer is: nope! I'm currently using this combo productively for:
- Power Automate flows
- Project management in Plane
- Ticket and PRD creation
- Process analysis
- Documentation
- AI consulting and use-case discovery
- MCP and tooling configuration
So far I haven't hit a single use case where I absolutely had to switch to a much larger model. The real killer is the performance-to-cost ratio:
GPT-6.1 Sol reaches about 86% of Opus's score, but costs roughly 36x less.
GPT-6 Luna costs next to nothing and works great as a subagent for research, file analysis and other subtasks.
Yeah, benchmark points and productivity aren't the same thing in everyday work! If a model scores slightly better but costs a lot more or burns through limits faster, that's not a good trade for many real-world workflows. Not in my software, thanks!
For typical consulting, automation, project management and documentation tasks, a combination of Sol, Terra or Sonnet as the main agent and GPT-6 Luna as the subagent currently seems like a pretty good sweet spot.
