Cosine
Your AI Co-developer - Not just an LLM Wrapper
Cosine launched on October 16, 2023 with 175 votes, #255 of 4,393 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 3 years on.
What it does
Cosine understands your codebase better than you do. It supports 50+ coding languages, allowing developers to ask any question about their codebase, get explanations about any feature and get suggestions about how to write new code.
Cosine trains AI models and specialised coding agents for organisations that need frontier capability within secure environments.
We train AI models and specialised coding agents for organisations that need frontier capability inside secure environments. Lumen is optimised for the outcomes that matter: shipping better code, faster, with fewer headaches. Most AI models try to be everything to everyone. They write poetry, solve physics problems, and summarise novels. Our thesis is simple. A model trained exclusively on real production code, from real engineering teams will always beat a generalist at the task developers actually need. That's why every training decision, every optimisation, every evaluation metric is grounded in a single objective: better code. Optimised for maintainability, readability, and…from cosine.sh
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