The story
Built by one person, from zero.
CorX Labs was founded by Nathan, a solo developer from Jamaica. For years the goal was the same one: build an AI — not adapt someone else's, but write the thing himself and train it up from random weights.
It started with APIs. An early chatbot built on top of Gemini, customised piece by piece — which worked, but was never the same as building from the ground up. Then came fine-tuning, which failed: slow GPUs, training runs that took forever, and eventually the decision to walk away from that approach.
CorX1.5 is what came out the other side. A custom transformer architecture, a tokenizer trained from scratch, a three-stage pipeline covering pretraining, distillation and reasoning — designed, debugged and trained solo on a single GPU. Every checkpoint in the repository represents real hours spent fixing data pipelines, chasing down overfitting, and learning how these systems actually work underneath.
It is open-sourced for exactly that reason: so other people can take it apart the same way.
Founder
Nathan
Founder & AI Researcher · Jamaica
Wrote the architecture, trained the tokenizer, ran the pretraining and fine-tuning, and maintains the model repository. Reachable at lkk89002@gmail.com.