Microsoft releases Agent Lightning v1.0 for training AI agents with their existing harnesses
Microsoft says Agent Lightning v1.0 lets developers train existing AI agents without rebuilding their harnesses inside a training framework.
• Microsoft open-sourced Agent Lightning v1.0 to train AI agents with the harnesses they use in deployment.
• The roughly 3,500-line framework runs agents locally or as standard Kubernetes jobs.
• Microsoft says a coding-agent example improved Qwen3.5-9B by 14.6 percentage points on SWE-bench Verified.
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October 8, 2026 27
