FrontierThe story, in brief
GLM-5.1: Towards Long-Horizon Tasks
GLM-5.1 claims breakthrough on long-horizon tasks. Here's what that actually means for your AI stack.
The KeyNews take
Why it matters
GLM-5.1 advances reasoning and multi-step task execution capabilities, positioning it as a direct competitor to GPT and Claude on complex, extended workflows—critical for enterprise AI deployment.
The key facts
4 to knowGLM-5.1 release focused on long-horizon task performance
Model positioning targets extended reasoning and multi-step execution
Competitive positioning against GPT and Claude class models
Published April 7, 2026
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Simon Willisonsimonwillison.net