OpenAI brings reinforcement fine-tuning to o4-mini
OpenAI just launched Reinforcement Fine-Tuning (RFT) for o4-mini, alongside supervised fine-tuning support for GPT-4.1 nano. RFT pairs chain-of-thought reasoning with task-specific grading to boost accuracy in complex fields like tax, accounting, and coding. It basically gives developers a way to turn OpenAI's fastest and cheapest models into custom domain experts.