LLM Development Tools
Stable2.3% of YC companies (+0.02pp)
Companies
137
Survival Rate
81.8%
Hiring Rate
16.8%
Recent Pivots
63
LLM Development Tools — Share of YC companies over time
Pivots into LLM Development Tools
Companies that pivoted into this category
Freesolo
Sp254 people · Active
Deep Research for People
Product Native Models
Butter
W252 people · Active
Muscle Memory Cache for Agents
Embedded Sandboxes for Agents
FastJVM
W173 people · Active
We Fix Email in Spam
Making the JVM faster
Coasts
F252 people · Active
AI-First In-Browser IDE for React Development
Localhost service isolation and orchestration for git worktrees
Approxima
W262 people · Active
One package to take your mobile app to production.
Your software should build itself.
Pivots out of LLM Development Tools
Companies that pivoted away from this category
Lightski
W231 people · Active· Pivot 2/2
The best way to stream LLM thinking traces to your frontend
AI Agents for Enterprises
KV Cash
W232 people · Active
Compare models and ouputs without random noise skewing your results.
KV Cash, a blockchain where contracts can finally think
Sharpe
S243 people · Active· Pivot 3/3
Build working software exceedingly fast in Solar
Agents for quantitative research and financial data science.
Burt
W262 people · Active
Easily fine tune and deploy specialized models
AI teammates for logistics
Solari AI
W241 people · Active
DataDog for LLMs, turnkey solution for n=1 custom evaluations
Gives non-technical team members agents that work right out of the box
Pivots within LLM Development Tools
Companies that changed direction but stayed in this category
CloudCruise
W243 people · Active
The developer platform for fast and reliable browser agents
The developer platform for fast and reliable browser agents
Jazzberry
Sp251 people · Active
Training LLMs to be expert bug finders
Building reinforcement learning environments
Sepal AI
S243 people · Active
The data development platform for LLM users and builders.
Building LLMs for Large Enterprises.