# TheorIC Labs releases a multi-provider AI client for Lean 4

> Source: <https://runtimewire.com/article/theoric-leanllm-lean-4-model-client>
> Published: 2026-10-15 00:03:04+00:00

# TheorIC Labs releases a multi-provider AI client for Lean 4

**TheorIC Labs founder Harsh Gupta built LeanLLM to bring model APIs into Lean-native types, while application code still has to check model output.**

        By [RuntimeWire Staff](https://runtimewire.com/author/runtimewire-staff)
        · Published 

Primary source: [X](https://x.com/hargup13/status/2110244706139484370)

## Why it matters

LeanLLM targets the gap between formal, typed application code and the loosely bounded model APIs developers increasingly call. Its promise depends on how well Lean's checks cover the code around a model response; they do not validate the model's claims or remove the need to handle external output carefully.

[Harsh Gupta (@hargup13)](https://x.com/hargup13?ref=runtimewire) said in [his October 14th announcement](https://x.com/hargup13/status/2110244706139484370?ref=runtimewire) that TheorIC Labs released [LeanLLM](https://github.com/theoriclabs/leanllm?ref=runtimewire), a client library that lets Lean 4 applications call models from multiple providers through one interface.…