GLM 5.3 Flash | EmpirioLabs AI Docs

Z.ai · Text Generation

POST /v1/chat/completions

Natively multimodal flash model with a 1M token context, image and video input, always-on reasoning, native web search, and tool calling.

At a glance

Field	Value
Model id	`glm-5-3-flash`
Model release date	2026-08-26
Input modalities	Text, Image, Video, File
Output modalities	Text
Context window	1M
Weight precision	-
Max output tokens	131,072
Region	Singapore
Features	reasoning, vision, video_understanding, document_understanding, 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-flash:generateContent`
Alternate model ids	`glm-5.3-flash`, `zai/glm-5.3-flash`, `zhipu/glm-5.3-flash`

Pricing

Charge	Spec	Rate
Input	per 1M prompt tokens	$0.075
Output	per 1M generated tokens	$0.25
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-flash", "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 Flash 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-flash.