GLM 5.3
zai-org/GLM-5.3
Open Source · chat · open-weights
Open
Alert me on changes
Intelligence
Context
1M
Max output
131.1K
Weights
Open
API $/1M
$1.40 / $4.40
Modalities
text
Released
25 Aug 2026
Intelligence Index via Artificial Analysis · 0–100, higher is better
License: other · zai-org/GLM-5.3
AI summary
● machine-written
GLM 5.3 open-weights chat model with 1M token context
GLM 5.3 is an open-source foundation model from Z.ai designed for complex systems design and agent workflows. It offers a 1,048,576 token context window and supports up to 131,072 output tokens. The model is available through multiple API providers and via Z.ai's direct API with published per-token pricing.
What's new
- 1,048,576 token context window with up to 131,072 token maximum output
- Pricing: $1.40 per million input tokens, $0.26 cached input, $4.40 output
- Available through multiple providers including OpenRouter, Z.ai, and others
- Supports reasoning effort levels (low, high, max) without rate changes
- Supports tool calling and structured outputs via JSON schema
Best for
Large-scale programming and system design tasksLong-horizon agent workflows and autonomous executionBackend reasoning and iterative self-correction workloadsApplications requiring extended context windows