Z.ai releases GLM-4.6

On September 30, 2025, Z.ai announced GLM-4.6 with expanded context window, improved coding performance, and enhanced reasoning capabilities.

"Today, we are releasing the latest version of our flagship model: GLM-4.6. Compared with GLM-4.5, this generation brings several key improvements." — Z.ai (Sep 30, 2025)

Key improvements

• Context window expanded from 128K to 200K tokens — Z.ai
• GLM-4.6 reaches 48.6% win rate against Claude Sonnet 4 on CC-Bench real-world tasks — Z.ai
• Completes tasks with 15% fewer tokens than GLM-4.5 — Z.ai

Supporting data

• Official announcement — Z.ai
• CC-Bench trajectory data — Hugging Face
• Coverage — South China Morning Post (Sep 30, 2025)