Greg IsenbergLearnAsk
Video26:39–27:11

Best open-source models for lightweight agentic tasks in 2025

By Greg Isenberg

If you want to use open-source models that are more affordable for lightweight tasks, GLM 5.1 from Z AI is the best open-source model available. Kimmy comes in as a close second, and both are meaningfully more affordable than closed models. For long-horizon coding tasks specifically, Opus 4.7 is excellent — you can even have your agent connect to Claude Code to handle those long coding tasks inside Claude Code, then bring the results back to the agent.

Go deeper with Greg Isenberg

Ask anything about this, and Greg Isenberg answers from everything they've shared.