GLM 5.3

Z.ai· released 18 Aug 2026

z-ai/glm-5.3

Input / 1M tokens: $1.4
Output / 1M tokens: $4.4

Context window1M tokens

Longest answer: 131K tokens

reads textopen weightstool callingreasoning

About

GLM 5.3 is a Z.ai reasoning model for complex software engineering and long-horizon agent tasks, according to its summary. It accepts and outputs text, supports tools, and has open weights. Its context window is 1,048,576 tokens, with a maximum output of 131,072 tokens. The model id is z-ai/glm-5.3, and its Hugging Face id is zai-org/GLM-5.3. Pricing is USD 1.4 per 1M input tokens and USD 4.4 per 1M output tokens. Z.ai released it on 2026-08-18. The summary says the model improves, but does not state what it improves or give a comparison, so that claim does not establish a specific capability beyond the listed focus on software engineering and agent tasks.

Who it is for

GLM 5.3 may suit teams building text-based software engineering or agent workflows that need tools and a long context window. Its open weights and per-million-token rates are listed for evaluation and budgeting.

What is good

Open weights
1,048,576-token context window
Supports tools and reasoning
Focuses on software engineering and agent tasks

What to know first

Accepts text input only
Costs USD 1.4 per 1M input tokens
Costs USD 4.4 per 1M output tokens

Verdict

GLM 5.3 offers open weights, tool support, and a context window exceeding one million tokens. Its listed token rates and text-only input are important fit considerations.

Details

Lab: Z.aiopenrouter.ai · 3 Oct 2026
Context: 1,049Kopenrouter.ai · 3 Oct 2026
Input price: $1.4 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $4.4 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 131,072 tokensopenrouter.ai · 3 Oct 2026
Inputs: textopenrouter.ai · 3 Oct 2026
Open weights: Yesopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/z-ai/glm-5.3· checked 3 Oct 2026