Synth

About

Choose a coding agent harness, model, and task dataset and optimize context and prompts to get the best performance for long-horizon tasks

Founders

• 
  Josh Purtell· Founder/CEO

  Josh is the founder and CEO of Synth. Before Synth, Josh was employee #3 and research scientist at Basis, which uses AI agents to automate accounting tasks. Previously, he built out the ML core of a Cyber Threat Intelligence SaaS product at Halborn, a cyber security startup that acqui-hired his startup Politeia. He founded Politeia while wrapping up a Math undergrad at Yale, where he did time-series ml research for fun.

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Product launches · 1 launch

• Synth: Automated Training for Vertical AI Agents ↗▲ 82Nov 23, 2024

  Making developing and maintaining a SOTA AI system simpler.

Change history · 9 recorded

1. October 11, 2026
   • Founder profile updated08:00 PM
   • Launches refreshed08:00 PM
   • YC partner updated08:00 PM
2. September 27, 2026
   • Founder profile updated08:00 PM
   • YC partner updated08:00 PM
   • Launches refreshed08:00 PM
3. September 13, 2026
   • Launches refreshed08:00 PM
   • Founder profile updated08:00 PM
   • YC partner updated08:00 PM