Vercel, a leading platform for full-stack web applications, partnered with Fireworks to enhance their AI code generation tool, v0, by focusing on maximizing output quality and inference speed. Utilizing advanced techniques such as Reinforcement Fine-Tuning (RFT) and speculative decoding, Fireworks significantly improved the v0 model's performance, achieving a 93% error-free generation rate and a 40X improvement in end-to-end latency. Vercel's v0 model, a composite AI architecture, integrates retrieval-augmented generation and a custom streaming post-processing model to deliver high-quality, error-free code. This collaboration underscores the advantages of open-source models over closed-source alternatives, as they allow for continuous adaptation to the evolving AI landscape, enhancing both accuracy and speed. The improvements have resulted in substantial gains in developer productivity and business impact, setting new benchmarks for AI-driven developer tools.