A New Approach to LLM Interpretability

Guide Labs has released Steerling-8B, claiming it as "the first interpretable model that can trace any token it generates to its input context, concepts a human can understand, and its training data." Unlike post-hoc interpretability tools that analyze existing models, Steerling-8B builds explainability directly into its architecture.

Three-Way Token Attribution

For any group of output tokens Steerling generates, three types of attribution are available simultaneously:

Input Feature Attribution — which tokens in the prompt most strongly influenced that output chunk. Concept Attribution — a ranked list of human-understandable topics (both tone concepts like "analytical" or "clinical," and content concepts like "genetic alteration methodologies") that the model routed through to produce the output. Training Data Attribution — how the concepts in that output distribute across training sources (ArXiv, Wikipedia, FLAN, etc.), revealing where in the training corpus the model's knowledge originates.

Technical Foundation

Steerling-8B is built on a causal discrete diffusion model backbone, which enables generation steering across multi-token spans rather than only next-token prediction. The model's embeddings are decomposed into three components corresponding to the three attribution types, making the attribution mathematically grounded rather than approximate.

Practical Applications

The interpretability isn't just academic. Steerling enables inference-time concept steering — suppressing or amplifying specific concepts without retraining, replacing thousands of safety training examples with explicit concept-level control. Trained on 1.35 trillion tokens, it achieves downstream performance comparable to models trained on 2–7x more data. Weights and code are publicly released on Hugging Face and GitHub.

Why This Matters

As AI systems are deployed in high-stakes domains — healthcare, law, finance — the ability to understand why a model produced a specific output becomes critical. Steerling-8B represents a significant step toward making LLMs accountable in the truest sense: not just capable of explaining outputs post-hoc, but architecturally designed to make every generation decision transparent.

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Steerling-8B: The First LLM That Can Explain Every Token It Generates