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hillclimb

YC F25

San Francisco, US · Founded 2025 · 4 employees · Hiring · 1 known investors

Hillclimb develops training data for recursive self-improvement in AI models, focusing on aggregating human research data and automating reinforcement learning environment creation. The company sells the resulting data to frontier AI laboratories.

Also known as Plun

Founders & leadership· Y Combinator alumni (F25)

hillclimb was founded in 2025 by Jun Park.

JPJun Park
Jun Parkin𝕏Founder · CEOJun Park previously worked at DeepMind and studied at Georgia Tech; he also has a background in professional Valorant.

Investors · 1

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Competitors · 4

by search overlap

Companies competing with hillclimb for the same Google search keywords, organic and paid, via search-intersection analysis.

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Frequently asked questions

What does hillclimb do?
Hillclimb develops training data for recursive self-improvement in AI models, focusing on aggregating human research data and automating reinforcement learning environment creation. The company sells the resulting data to frontier AI laboratories.
Who founded hillclimb?
hillclimb was founded by Jun Park in 2025.
Who are hillclimb's investors?
hillclimb's investors include Y Combinator.
Where is hillclimb headquartered?
hillclimb is headquartered in San Francisco, US.