dspy.RLM — Recursive Language Model

dspy.RLM runs the LLM in a sandboxed Python REPL (Pyodide/WASM via Deno) with access to the full context as variables. The LLM writes code to slice, grep, summarize, and recursively sub-query the data, iterating until it can answer. Use it when the context is too large to cram into a single prompt.

Prerequisites

• Deno installed (for the default PythonInterpreter): brew install deno or see https://deno.land. The interpreter is a Pyodide-in-WASM sandbox spawned by Deno.
• A sub-LM for inner calls — usually a cheaper model than the outer LM. Defaults to dspy.settings.lm.

Canonical usage

import dspy

dspy.configure(lm=dspy.LM("openai/gpt-4o"))
sub_lm = dspy.LM("openai/gpt-4o-mini")    # cheap inner model