Tokenless (YC S26) — We find flaws in RL environments and evals and help you fix them
Tokenless is an applied AI research lab, and our goal is to end reward hacking. We do research and build tools to detect issues with environments and evals, understand model behavior in those environments, and prevent those issues from happening.
Tokenless is a Y Combinator company in the Summer 2026 batch. Its directory entry describes it as: We find flaws in RL environments and evals and help you fix them. The founders listed are Rohit Agarwal (Founder), Andrew Liu (Founder), Kevin Wang (Founder) (Y Combinator directory entry, August 14, 2026).
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Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
Tokenless is an applied AI research lab, and our goal is to end reward hacking. We do research and build tools to detect issues with environments and evals, understand model behavior in those environments, and prevent those issues from happening. Correcting them makes training more effective, makes model performance easier to interpret, and is crucial to solving the AI alignment problem.
If you’re training models with RL, building environments, or running agent evals, and want more confidence in your environments, we're here to help.
Rohit Agarwal
Founder
Andrew Liu
Founder
Kevin Wang
Founder
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
One of 338 companies held here in B2B › Infrastructure.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
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Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
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The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
1 cited source found
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Tokenless (YC S26) — We find flaws in RL environments and evals and help you fix them. MentionFox, 2026-10-20. https://mentionfox.com/funding/yc-tokenless
