Best open-source models for lightweight agentic tasks in 2025
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.
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