Heavybit · Dec 2025
Heavybit announces its investment in Vibrant Labs and describes the company as building production-grade, RL-ready simulation and verifier-driven evaluation for long-horizon AI agents.
RL environments for long horizon AI Agents
Public company, workplace, funding, and market signals
Updated Jul 29, 2026
Vibrant Labs is a San Francisco-based applied research and AI infrastructure company building RL-ready simulation environments, benchmarks, and verifier-driven tooling for long-horizon agents. It emerged from the Ragas open-source evaluation project and now focuses on autonomous environment generation for tool-use and computer-use agents.
Primary product
RL-ready simulation environments and self-evolving benchmarks for long-horizon AI agents
Founded
2023
Headquarters
San Francisco, California, United States
Team size
2-10 employees
Work style
Remote
Industry
Software Development
Sub-industry
AI infrastructure / developer tools / agent simulation
0 jobs at Vibrant Labs
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Offices
Business model
Stage
Pre-seed
Total raised
$2.5M
Latest round
Pre-seed · Dec 2025
Latest amount
$2.5M
Dec 2025 · Y Combinator
Research-driven, open-source-oriented, and builder-researcher culture focused on making AI systems work in the real world, with an emphasis on benchmarking, evaluation, and safe-to-fail simulation.
Work style
Remote
Differentiators
Technology
Customers
Heavybit · Dec 2025
Heavybit announces its investment in Vibrant Labs and describes the company as building production-grade, RL-ready simulation and verifier-driven evaluation for long-horizon AI agents.
iSrch.com · Dec 2025
Third-party coverage of the company’s $2.5M pre-seed round and launch focus on benchmarking and improving long-term AI agent capabilities.
LinkedIn · Dec 2025
Investor/partner post announcing support for Jithin James and Shahul Elavakkattil Shereef as they build RL-ready worlds and developer workflows for long-horizon AI agents.
Signalbase · Dec 2025
Funding roundup coverage summarizing the company’s $2.5M pre-seed raise and its agent-testing / simulation-environment positioning.
Vibrant Labs · Nov 2025
Official launch post announcing Vibrant Labs’ emergence from stealth, its $2.5M pre-seed round, and its focus on RL-ready simulation environments for long-horizon agents.