Z.ai: GLM 5.3 FlashX

z-ai/glm-5.3-flashx

GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds of up to 200 tokens/s. Built on the same hybrid sparse and linear attention architecture...

Modalities

In / out price

$0.37 / $1.25 per 1M

Context

1.05M

Released

Sep 18, 2026

Why use GLM 5.3 FlashX

Understands images
Step-by-step reasoning mode
Tool and function calling (agent-ready)
Structured (JSON) outputs
Very long context: whole books or codebases in one prompt

Pricing

Input	$0.37 / 1M tokens
Output	$1.25 / 1M tokens
Cached input (read)	$0.090 / 1M tokens

List prices via OpenRouter, checked daily. Real cost depends on the provider and on reasoning tokens.

Cost calculator

Pick a task, set how often you run it, and compare what it costs on each model.

TaskInput tokens≈ 602 wordsOutput tokens≈ 1,504 wordsRuns per month

Input served from cache: 0%Repeated prompts (same instructions or document) are billed at the cheaper cache-read price where the model supports it.

Model	Per run	Per month	Per 1,000 runs
Z.ai: GLM 5.3 FlashX	$0.0028	$2.80	$2.80

Estimates from list prices via OpenRouter; real bills vary by provider and reasoning tokens.

Will it fit? Context window simulator

Each square is about one page (500 words). Colored squares are your content; grey squares are free space in the model's context window.

Your content

Novel (90,000 words)

Total: about 120,000 tokens (≈ 90,226 words). Token counts are estimates.

Models

Zoom (square size): 6pxZoom out to see a whole million-token window at once.

Z.ai: GLM 5.3 FlashX

1,048,576 tokens ≈ 1,577 pages

Fits: uses 11% of the window (room for 8× this much).

Write with the best model for the job

WordGPT picks and switches models for you: drafting, editing and files in one place. Free plan, no credit card.

Try it free

Why use GLM 5.3 FlashX

Pricing

Cost calculator

Will it fit? Context window simulator

Z.ai: GLM 5.3 FlashX

More from Z.ai (GLM)