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Jazzberry

Jazzberry is a YC Spring 2025 (P25) company. Based in San Francisco, CA, USA. Team of 1.

  • Artificial Intelligence
  • Developer Tools
  • Reinforcement Learning
  • SaaS
  • ML

About Jazzberry

GPAgent's own fund-neutral profile, written from public information. Updated Oct 5, 2026.

Summary

Jazzberry builds reinforcement learning environments used to train frontier AI models. The product gives model developers ready-made simulation environments that would otherwise require custom engineering to construct from scratch. It targets AI labs and research teams that need structured training grounds to develop and refine large-scale models.

From the Y Combinator listing

How Jazzberry describes itself in Y Combinator's public directory. Original listing (opens in a new tab)

Building reinforcement learning environments

We're creating reinforcement learning environments for training frontier models.

Facts

Industry
B2B / B2B
Location
San Francisco, CA, USA
Team size
1
Status
Active
Stage
Early

Founders (1)

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