Vercel CEO Guillermo Rauch said fx’s default auto mode uses a safety reviewer on every command. That reviewer runs on GPT Luna today; TypeSafe’s Jev is up to about 18× faster at p95 and more accurate, and is coming to Vercel AI Gateway as a likely new default. Earlier, a Vercel engineer reported Jev saturating a classifier eval vs Gemini 2.5 Flash Lite while running about 6× faster.

Key Takeaways

  • ✓Rauch: Jev coming to Vercel AI Gateway and likely the new default reviewer
  • ✓Up to ~18× faster (p95) and more accurate than GPT Luna for command safety review
  • ✓Companion eval: Jev saturated quality vs Gemini 2.5 Flash Lite at ~6× speed
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