GLM 5.3

Name: GLM 5.3
Author: Reka AI

reasoningmit

GLM 5.3 is an open-weight mixture-of-experts reasoning and coding model with a 1M context window, hosted by Reka. It is served as an OpenAI-compatible passthrough with native tool calling, structured outputs, logprobs, and streaming.

Context

1.0M

Max output

262K

Input price

$1.17/1M tokens

Output price

$3.96/1M tokens

Capabilities

Show unsupported (1)

Reasoning & Interaction

Reasoning

Tool Calling

Output Control

Structured Output

JSON Mode

Infrastructure

Streaming

Prompt Caching

Fine-tuning

Details

Model IDglm5.3

ProviderReka AI

CreatorZ.AI (Zhipu)

Familyglm

Licensemit

Statusactive

Typereasoning

Input modalitiestext

Output modalitiestext

Open weight—

Parameters—

Architecture—

Context window1.0M tokens

Max input—

Max output262K tokens

Reasoning tokens—

Knowledge cutoff—

Release date—

Sourceofficial

Tools

Function Callingfunction_calling

Call external functions and APIs

Endpoints

Chat CompletionsPOST

Generate chat responses with messageshttps://api.reka.ai/v1/chat/completions

Pricing

Input

$1.17

Output

$3.96

Cache write

—

Cache read

$0.23

Batch in

—

Batch out

—

Family Comparison: glm

Model	Caps	Perf	Speed	Context	Max out	Pricing
GLM 5.3 Flash	RTJJMS	—	—	1.0M	1.0M	$0.15$0.5
GLM 5.3	RTJJMS	—	—	1.0M	262K	$1.17$3.96

API

GET/v1/models/reka/glm5.3