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Fireworks Training is now in preview: an end-to-end platform for training and deploying frontier models at scale. Three surfaces for three kinds of teams, from a conversational agent that handles everything, to managed infrastructure for ML engineers, to bring-your-own training loop on Fireworks-hosted clusters. All on the same infrastructure that already handles production inference for Cursor, Vercel, Genspark, and others. All three surfaces are in preview now. Reinforcement learning is how teams push past the ceiling SFT hits on multi-step reasoning, reliable tool use, and mid-flight self-correction. Vercel used our RL infrastructure to build a custom "Auto Fix" model for v0. The model checks the output stream for errors and self-corrects without a second pass, reaching a 93% error-free generation rate, significantly outperforming closed frontier models, with a 40X improvement in end-to-end latency vs. the proprietary model it replaced and…