Finetuning: 500m AI agents in production with 2 engineers — Mustafa Ali & Kyle Corbitt
Apr 12, 2025 · 18:44
Method Financial and OpenPipe detail how Method scaled AI financial agents to 500 million daily interactions using fine-tuned open-source models instead of expensive GPT-4. After racking up $70,000 in monthly GPT-4 costs and facing latency and error issues, they fine-tuned an 8B parameter LLaMA 3.1 model to achieve under 200ms latency and 9% error rate (beating GPT-4o's 11% at lower cost). Mustafa Ali explains that the key was using production data from GPT as training data and choosing the cheapest model that met performance goals. Kyle Corbitt emphasizes that fine-tuning is a power tool for bending the price-performance curve when prompt engineering falls short. The episode argues that productionizing AI agents requires patience and openness from engineering teams, and concludes with a call for software engineers to pivot to AI engineering.
