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Polymath

Polymath

Simulated worlds for end-to-end AI training

Member of Technical Staff - Research

Full-Time
$150k - $300k/yr
Mid
San Francisco, CA, USA
In Person

About the job

Requirements
  • Strong engineering and research fundamentals.
  • Prolific use of artificial intelligence tools.
  • Experience post-training frontier models.
  • Experience shipping reliable, production-quality code.
  • A track record of publications.
Responsibilities
  • Investigate failure modes of frontier models.
  • Create rigorous benchmarks evaluating frontier agents on complex, realistic tasks requiring long-horizon reasoning and tool use in dynamic environments.
  • Post-train agents that can reason, plan, and act over extended time horizons.
  • Publish research.
  • Build benchmarks and simulation environments, write production code, and run rigorous experiments.

About the company

Polymath AI Labs builds simulated worlds to train AI agents on real-world, long-horizon tasks. Its simulations combine running applications, real tools, and multi-step workflows to teach end-to-end software development and other complex tasks. A flagship product, Horizon-SWE, evaluates an agent’s ability to plan, code, test, and deploy inside a simulated software company. The goal is to create reliable, autonomous AI systems that can operate with minimal human supervision in real-world settings.

Company Size

1-10

Company Stage

Seed

Total Funding

$130K

Headquarters

San Francisco, California

Founded

2025

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Simplify's Take

What believers are saying

  • YC listed Polymath active on August 26, 2026, with six employees.
  • Polymath updated its site on September 4, 2026, naming Base10, Cervin, and YC.
  • Horizon-SWE launched February 6, 2026 and benchmarked frontier models credibly.

What critics are saying

  • No public revenue, customer logos, or contracts prove demand beyond frontier labs.
  • OpenAI, Anthropic, and Google can build internal simulators faster than a six-person startup.
  • If benchmark quality stalls, Polymath becomes a replaceable services vendor by 2027.

What makes Polymath unique

  • Horizon-SWE uses a containerized software company with 73 tools and live traffic.
  • It scores agents across feature correctness, DevOps, and engineering quality, not toy tasks.
  • YC Winter 2026 founders bring Hume, Plaid, AWS, Amazon, and Berkeley pedigrees.

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Benefits

Health Insurance

Dental Insurance

Vision Insurance

401(k)

Unlimited Paid Time Off

Commuter Benefits

Gym Membership

Meal Benefits