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License

CircuitKIT is released under the Lexsi Labs Source Available License (LSAL) v1.2, a source-available (not open-source) license. It grants academic research and teaching MIT-like permissions; use by any organization requires written acknowledgement or permission from Lexsi Labs (Section 1A); 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 academic research and teaching, on MIT-like terms (notice intact).
  • Organizations must acknowledge their use or obtain permission (Section 1A) before internal evaluation, red-teaming, benchmarking, or safety 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 acknowledgements and permission requests (Section 1A) and 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},
}