Audience

Developers, AI engineers, agent builders, researchers, and organizations that need cost-efficient multimodal reasoning, long-context processing, advanced coding, visual analysis, and autonomous workflow capabilities

About GLM-5.3-Flash

GLM-5.3-Flash is Z.ai’s natively multimodal model in the GLM-5 series (previously previewed as Ox Alpha), designed to deliver strong coding, agentic, visual, and knowledge-work performance at relatively low inference cost. It uses 320 billion total parameters with 18 billion active parameters, along with a hybrid architecture that combines sparse and linear attention to reduce the cost of long-context processing. The model supports context lengths of up to one million tokens and was trained on a 30-trillion-token multimodal corpus. GLM-5.3-Flash can reason across text, images, documents, interfaces, dashboards, and other visual information while using that feedback to refine its own outputs. Z.ai reports substantial gains over GLM-5.2 on coding and agentic benchmarks, including DeepSWE and AutomationBench, while approaching higher-cost frontier models on several evaluations.

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Pricing

Starting Price:
$0.15 per 1M tokens (input)
Pricing Details:
Input: $0.15 per 1M tokens
Output: $0.50 per 1M tokens
Cached input: $0.03 per 1M tokens

Integrations

API:
Yes, GLM-5.3-Flash offers API access
See Integrations

Ratings/Reviews - 1 User Review

Overall 5.0 / 5
ease 5.0 / 5
More Reviews Write a Review

Company Information

Z.ai
Founded: 2019
China
z.ai

Videos and Screen Captures

GLM-5.3-Flash Screenshot 1
GLM-5.3-Flash Screenshot 1
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Product Details

Platforms Supported
Cloud
Training
Documentation
Support
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GLM-5.3-Flash Frequently Asked Questions

Q: What kinds of users and organization types does GLM-5.3-Flash work with?
Q: What languages does GLM-5.3-Flash support in their product?
Q: What kind of support options does GLM-5.3-Flash offer?
Q: What other applications or services does GLM-5.3-Flash integrate with?
Q: Does GLM-5.3-Flash have an API?
Q: What type of training does GLM-5.3-Flash provide?
Q: How much does GLM-5.3-Flash cost?

GLM-5.3-Flash Product Features

GLM-5.3-Flash Verified User Reviews

Write a Review
  • An Ox Alpha User
    Developer
    Used the software for: Free Trial
    Frequency of Use: Daily
    User Role: User
    Company Size: 100 - 499
    Ease
    Pricing
    Probability You Would Recommend?
    1 2 3 4 5 6 7 8 9 10

    "GPT-5.3-Flash Review"

    Posted 2026-08-24

    Pros: What makes it exciting is that it seems built for the exact workloads developers care about right now: long-horizon coding, complex reasoning, big-context analysis, and agentic workflows. A million-token context window is especially useful if you want to drop in a large repo, long spec, research corpus, or messy project history and have the model reason across it.

    Cons: I would treat it as something exciting to test, not something to blindly trust with sensitive work.

    Overall: Updating my review now that Ox Alpha was revealed to be GPT-5.3-Flash. GPT-5.3-Flash feels like one of the more interesting stealth model launches because it combines huge context, strong developer buzz, and serious agentic-coding positioning. If the eventual creator backs up the early hype with transparency, reliability, and clear commercial terms, this could become a major model for developers and AI power users.

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