The use case: how Vercel deploys Fireworks AI
Vercel uses Fireworks AI to run and fine-tune an open-source model that automatically fixes errors in code generated by its v0 tool. It applies reinforcement fine-tuning and speculative decoding to improve error-free output and speed.
More reported results
Figures published in Fireworks AI’s case study. They are not independently measured by usedby.
The result is a platform capable of achieving a 93% error-free generation rate and a 40X improvement in end-to-end latency for v0 users, setting a new benchmark for developer-facing AI tooling.
In our evaluation, Sonnet 3.5 compiled at 62%, and we got our error-free generation rate well into the 90s
In the customer’s words
Vercel's v0 model is a composite model. The SOTA in this space changes every day, so you don't want to tie yourself to a single model. Using a fine-tuned reinforcement learning model with Fireworks, we perform substantially better than SOTA. In our evaluation, Sonnet 3.5 compiled at 62%, and we got our error-free generation rate well into the 90sVercel’s v0 model is a composite model. The SOTA in this space changes every day, so you don’t want to tie yourself to a single model. Using a fine-tuned reinforcement learning model with Fireworks, we perform substantially better than SOTA.Other AI tools used by Vercel
Other public relationships recorded on usedby.
AWS BedrockConfirmed
NotionConfirmed
BasetenObserved
BraintrustObserved
BrightHireObserved
BrowserbaseObservedFireworks AI users in DevTools & Infrastructure
Companies in the same sector, with public evidence.
See all Fireworks AI customers
Go straight to the source
Based on Fireworks AI’s published case study. We check the public evidence; the results are reported by the vendor.
fireworks.ai- Source published
- Nov 3, 2025
- Last checked
- Oct 31, 2026
Open source capture What the story claims, and what we checked
What we compared with the page.
- The figure: 40XChecked
Printed word for word on the page, near the name of Vercel.
- The passage quoted aboveChecked
Copied word for word from the page, near the name of Vercel.
- The numbers in our summaryChecked
Each one is printed on the page.
- The publication dateChecked
Read from the page’s own metadata, never guessed.
- Vercel uses Fireworks AIChecked
Confirmed line.
- The result itselfNot checked
We quote it; we did not measure it.
The result is a platform capable of achieving a 93% error-free generation rate and a 40X improvement in end-to-end latency for v0 users, setting a new benchmark for developer-facing AI tooling.