License¶
CircuitKit is released under the Lexsi Labs Source Available License (LSAL) v1.1, a source-available (not open-source) license. It grants free use for research, evaluation, education, and audit; commercial use requires a separate license from Lexsi Labs; and responsible-use conditions apply to safety-relevant behaviors. The full terms are in LICENSE.md.
In short:
- Free for noncommercial research, evaluation, education, and auditing.
- No commercial use (SaaS, hosted, embedded, or paid support/consulting) without a separate commercial license.
- Responsible use: do not use CircuitKit to locate, remove, or weaken the safety behaviors of a model for deployment, and re-evaluate any intervention-exported checkpoint's safety before deploying it.
- © 2026 Lithasa Technologies Pvt. Ltd. Contact support@lexsi.ai for commercial licensing.
Third-Party Licenses¶
CircuitKit depends on and integrates with several open-source projects:
| Library | License | Usage |
|---|---|---|
| TransformerLens | MIT | Circuit discovery backend |
| PyTorch | BSD-3-Clause | Tensor computation |
| Transformers (HuggingFace) | Apache 2.0 | Model loading and checkpoint export |
| PEFT (HuggingFace) | Apache 2.0 | LoRA fine-tuning |
| lm-evaluation-harness | MIT | Downstream benchmarking |
| EasyEdit | MIT | ROME baseline in validation examples |
| vLLM | Apache 2.0 | Optional fast evaluation backend |
| MkDocs | BSD-2-Clause | Documentation |
| Click | BSD-3-Clause | CLI framework |
| Rich | MIT | CLI output formatting |
See each library's repository for their full license text.
Citation¶
If you use CircuitKit in academic work, please cite:
@software{circuitkit2026,
title = {CircuitKit: Circuit Discovery, Evaluation, and Application Toolkit
for Mechanistic Interpretability},
author = {Seth, Pratinav and Gosalia, Hem and Kasliwal, Aditya
and Sankarapu, Vinay Kumar},
year = {2026},
version = {1.0.0},
url = {https://github.com/Lexsi-Labs/circuitkit},
}