GLM-5.3

Flagship GLM model for long-horizon coding, agents, and complex project delivery

ECI STANDING#25 of 266
SCORE155.25153.18–157.53 CI
FRONTIER LAGLaunched 8.1 months behindScores about what GPT-5.2 Pro did in December 2025.
Full Epoch Capabilities Index ranking

From the lab

Launch announcement · Aug 18, 2026GLM-5.3
RELEASE DATEAug 14, 2026
WEIGHTSOpen weights
CONTEXT WINDOW1M
MAX OUTPUT131.1K
REASONINGYes
TOOL CALLINGYes
INPUTStext
OUTPUTStext

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