Paper Instruments (YC X25) — Open-source frontier models for knowledge work
Paper Instruments post-trains LLMs to accelerate knowledge work.
Paper Instruments is a Y Combinator company in the Spring 2025 batch. Its directory entry describes it as: Open-source frontier models for knowledge work. The founders listed are Daanish Khazi (Founder/CEO), Gavin Bains (Founder), Joseph Besgen (Founder) (Y Combinator directory entry, May 21, 2025).
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Paper Instruments (formerly The LLM Data Company) trains frontier models and builds post-training infrastructure and agent-first software for knowledge work.
The title and description the site itself served, answering 200. Not a cached copy and not the company's directory entry — what was live when we asked.
Daanish Khazi
Founder/CEO
Building Paper Instruments
Gavin Bains
Founder
Building Paper Instruments
Joseph Besgen
Founder
Building Paper Instruments
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.
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): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
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What the Full Report on Paper Instruments covers
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
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