GLM 5.3 | EmpirioLabs AI Docs

Z.ai · Text Generation

POST /v1/chat/completions

Coding and agentic model with a 1M token context, 128K output, always-on reasoning at low, high, or max effort, native web search, and tool calling.

At a glance

Field	Value
Model id	`glm-5-3`
Model release date	2026-08-14
Input modalities	Text
Output modalities	Text
Context window	1M
Weight precision	-
Max output tokens	131,072
Region	Singapore
Features	reasoning, function_calling, web_search
Native inference	No
New	Yes
Structured output	JSON Mode
Supported endpoints	`POST /v1/chat/completions`, `POST /v1/responses`, `POST /v1/messages`, `POST /v1beta/models/glm-5-3:generateContent`
Alternate model ids	`glm-5.3`, `zai/glm-5.3`, `zhipu/glm-5.3`

Pricing

Charge	Spec	Rate
Input	per 1M prompt tokens	$1.40
Output	per 1M generated tokens	$4.40
Web search	per request	$0.033

Example request

curl https://api.empiriolabs.ai/v1/chat/completions \
  -H 'Authorization: Bearer $EMPIRIOLABS_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"model": "glm-5-3", "messages": [{"role":"user","content":"Hello"}]}'

Parameters

Parameter	Type	Required	Default	Description
`max_tokens`	integer	no	`65536`	Maximum number of output tokens to generate. · Range: 1 – 131072
`temperature`	number	no	`1`	Controls randomness. Lower values make responses more deterministic. · Range: 0 – 1
`top_p`	number	no	`0.95`	Nucleus sampling cutoff. · Range: 0.01 – 1
`reasoning_effort`	enum	no	`"max"`	GLM 5.3 reasoning effort. This model always reasons and cannot be turned off. low is lightweight, high is enhanced, and max is deep reasoning. max is recommended for complex coding. · Allowed: `low`, `high`, `max`
`do_sample`	boolean	no	true	Enable sampling. Turn off for greedy deterministic output (temperature and top_p are ignored).
`tool_web_search`	boolean	no	false	Enable built-in web search. Adds $0.033 per request when used.
`search_recency_filter`	enum	no	`"noLimit"`	Limit web search results to a recency window. · Allowed: `oneDay`, `oneWeek`, `oneMonth`, `oneYear`, `noLimit`
`count`	integer	no	`10`	Number of web search results to retrieve when web search is enabled. · Range: 1 – 50
`search_domain_filter`	string	no	-	Restrict web search to a specific domain.
`search_prompt`	string	no	-	Optional prompt used to summarize retrieved web search results.
`search_result`	boolean	no	true	Return web search result metadata in the response when web search is enabled.
`tool_stream`	boolean	no	false	Stream function-call arguments incrementally when streaming.
`tools`	array	no	`[]`	OpenAI-compatible function calling tool definitions.
`tool_choice`	object	no	-	OpenAI-compatible tool choice control.
`stop`	array	no	-	Optional stop sequences (up to 4).
`response_format`	enum	no	-	Return the output as a valid JSON object (JSON mode). Describe the fields you want in your prompt.

Machine-readable schema: GET https://api.empiriolabs.ai/v1/models/glm-5-3.