ReasonBlocks

<!-- hacklab:yc-profile -- YC company profile Specialized models that make your AI agents cheaper and more reliable. ReasonBlocks turns your agents’ production traces into speci…

Website (opens in a new tab)

About ReasonBlocks

YC company profile

Specialized models that make your AI agents cheaper and more reliable.

ReasonBlocks turns your agents’ production traces into specialized models, delivering 10× cheaper inference without sacrificing performance. We handle training, routing, and serving.

  • YC batch: Spring 2026
  • Team size: 2
  • Location: San Francisco
  • Country: US
  • Status: Active
  • Industry: B2B
  • Stage: Early
  • YC partner: Aaron Epstein

Founders

Sajeev Magesh — Founder/CEO

Formerly at Stanford CS. Published in Nature Sustainable Agriculture (ML × agriculture). UN Best Paper. USAMO qualifier.
Now building specialized intelligence that makes AI agents cheaper and more reliable at ReasonBlocks.

LinkedIn

Source: Y Combinator · Retrieved 2026-11-02. Company information is self-reported on YC.