Open sourceOpen-source releaseAgents & Tool Use · MLOps, Tooling & Infrastructure · Large Language Models1 source · Oct 12, 2026

stanfordnlp/dspy 3.4.1

DSPy 3.4.1 makes GEPA's structured InstructionProposer the default instruction proposer and lets dspy.RLM build DSPy sub-agents from inside its REPL.

Key points

  • Upgrade notices. GEPA's default reflection request changes shape, so optimization results can differ from 3.4.0 even with the same seed.
  • The reflection LM must now be a dspy.LM that can return JSON.
  • Every RLM prompt now includes a sub-agent section, and maxllmcalls now also counts sub-agent LM calls. dspy.ReActV2 signatures can no longer declare inputs named history or tools.
  • dspy.GEPA now builds InstructionProposer() when you don't pass instructionproposer=.

Sources (1)

  • [1]stanfordnlp/dspy 3.4.1
    GitHub: stanfordnlp/dspy · Oct 12, 11:12 PM
    DSPy 3.4.1 makes GEPA's structured `InstructionProposer` the default instruction proposer and lets `dspy.RLM` build DSPy sub-agents from inside its REPL.
    **Upgrade notices.** GEPA's default reflection request changes shape, so optimization results can differ from 3.4.0 even with the same seed.

Extractive summary: sentences quoted from the sources.

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