Mirendil announces $1 billion Series A for AI research tools

Mirendil announced a $1 billion Series A on November 12, 2026, with Kleiner Perkins and Clearlake Capital leading the round.[1][2] Battery Ventures, Doerr Capital, Gil & Co, Google, M13, Pear VC and S32 also participated, along with other new and existing investors.[2] Mirendil says it is building tools to make frontier AI research and development accessible to scientists and engineers.[2] The company says the funding will help it pursue work that previously required a team or an institution with fewer people.[2]

To illustrate its approach, Mirendil says one researcher working with agents pretrained Mirendil-Base from scratch in 3.5 months, with less than $10 million in compute.[2] It says AI agents wrote more than 99% of the code for the experiment.[3] The reported compute figure included agent token spending and data processing, according to Mirendil.[3] The company says all training data came from GitHub and other publicly available code, web pages and datasets.[3] Mirendil-Base is in the 100-billion-to-500-billion-parameter range.[3]

Mirendil says Fern is its first model and was pretrained from scratch.[4] Fern supports a context window of up to 10 million tokens, which the company says can hold about half a million lines of code.[4] Mirendil designed Fern for high-volume agentic tasks such as debugging training runs, analyzing agent traces and auditing training data.[4] The company listed access to Fern as coming soon.[4] The stated use cases and availability make the model’s intended role clearer, but the evidence does not provide pricing or access dates.

Mirendil says its Lor agents can split a job across dozens of agents, with hundreds running across a user’s projects, and can unblock themselves when something breaks.[5] The company also says Lor agents can request, configure and release compute nodes themselves.[5] Lor was available by invitation only in a private beta, free during that beta, and supported macOS, Linux and the web.[5] Windows, iOS and Android support were listed as coming soon.[5] Earlier, Mirendil disclosed a $200 million seed round on June 24, 2026, and announced a multi-year Google Cloud partnership on August 6, 2026.[1]