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Y Combinator-backed AI developer startup Cosine raises $2.5m

Cosine AI
Image Credit: Cosine

Cosine, a startup that says it can “codify” how humans perform software writing tasks so it can be replicated by AI, has raised $2.5m (£1.9m).

The round was led by Uphonest and SOMA Capital, with participation from Lakestar, Focal, and others.

Founded in 2022 by software engineer Alistair Pullen, exited chief growth officer Yang Li, and Sam Stenner, the startup claims it can train human reasoning into any AI model through proprietary synthetic data generation.

Its mission is to teach “AI to reason, providing companies with a true AI colleague.”

Cosine’s website states its approach is “the opposite of throwing spaghetti at the wall”.

The Y Combinator-backed startup says it has achieved a 30% score on SWE-Bench, the industry standard for evaluating software engineering skills in AI models. This benchmark assesses an AI model’s ability to understand, modify, and generate complex code.

According to Cosine, this marks the highest score achieved by any company to date.

Pullen, the startup’s CEO, said: “Our breakthrough in codifying human reasoning is allowing us to train AI models to operate far beyond the narrow range of tasks and tightly restricted prompts currently available to teams developing software.”

Its Artificial Developer, Genie, is said to work like a human developer. The startup claims it’s capable of solving bugs, building features, and refactoring code, either by itself or collaboratively with other developers.

“We’ve developed a product capable of outperforming OpenAI and others in completing complex software tasks—in a fraction of the time and cost it has taken our competitors to achieve the same results. We’re on course to radically transform the way development and developers work,” COO Li added.

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