ReasoningLens

ReasoningLens: Open-source framework for hierarchical visualization and auditing of LLM reasoning chains

ReasoningLens is an open-source framework for visualizing and diagnostically auditing the long chain-of-thought traces produced by large reasoning models. It structures traces into interactive hierarchies separating high-level strategy from low-level execution, uses an agentic auditor for automated error detection, and synthesizes model-specific reasoning profiles to surface blind spots. The work targets a growing transparency problem as reasoning models produce increasingly long and opaque inference traces.