New · The first pre-trained model built with Think, Reason, Learn
FounderBrain
See how you came across in a pitch or investor call, compared with 773 public founder interviews, and get coached on what to try next. It is free, it works inside Claude, and it does not store your transcript.
Illustrative example · made-up founder
Leo Martin
The Candid Advocate
Enthusiasm
More enthusiastic than 94% of founders
MeasuredEnthusiastic
Openness
About as personal as most founders
PersonalReserved
Certainty
Firmer claims than 91% of founders
QualifiedFirm
Explains with
More analytical than 74% of founders
DataStories
Talks most like Jensen Huang, founder and CEO of Nvidia, 91% match
Built with Think, Reason, Learn
Think, Reason, Learn is an open-source Python library for building prediction models that show their reasoning. It keeps the shape of decision trees, forests and rule sets and lets each step ask a language model to reason, so every prediction comes with the rules behind it. It comes from Vela Research, the research arm of Vela Partners, working with the University of Oxford.
pip install think-reason-learnPython 3.13 or newer, MIT licence. View on GitHub
The toolbox
- GPTree, decision trees whose questions a language model writes
- Random Rule Forest, many yes or no questions combined into one transparent model
- Policy Induction, short policies learned from examples that a person can check
Models
Trained models you can use as they are. FounderBrain is the first, built on 773 public founder interviews, and more are on the way.
About FounderBrainDatasets
The data the models learn from. The transcript sets behind FounderBrain are shared on request, and VCBench is Vela's benchmark for venture decisions.
Research
FounderBrain's method
NeurIPS 2026, TAE (Trust-AI-Eval): Can We Trust AI Evaluation? workshop. The paper is coming soon.
Papers behind the toolbox
Random Rule Forest, Policy Induction and the other methods, with links, are on the research page.
VCBench
The first benchmark for venture capital decisions, at vcbench.com.