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Z.ai / Zhipu AIOpen-weight·1000K context·320B params·MIT

GLM 5.3 Flashzhipu/glm-5-3-flash

GLM 5.3 Flash is a multimodal reasoning model for visual analysis, software development and agent tasks. The Flash architecture has 320B total parameters with 18B active per token; FlashX is the faster hosted serving option. Both accept visual inputs and generate text.

Cheapest blended:$0.24 / 1M tokenson Zhipu AI · 1 provider listed

Availability and billing notes

Reviewed September 21, 2026 · check the linked provider documentation for later changes.

Reasoning is always enabled. The advertised serving speed is a vendor claim, not an independently measured latency result.

Prices below are USD rates from the international Z.ai API. Coding Plan allowances and mainland China pricing are separate.

Official source 1 →Official source 2 →

Pricing across providers

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ProviderInput /1MOutput /1MBlended /1MLatency p50FormatFreshnessAction
Zhipu AI
glm-5.3-flash

International Z.ai API, USD; Coding Plan subscription usage is separate.

$0.15
Cached $0.03
$0.5$0.237—OpenAI-compatibleNeeds 15d agoTry →

Affiliate disclosure: We may earn a commission from qualified signups. Pricing independence is enforced at the data layer — see our Editorial Independence Policy.

Works with

Point any of these clients at a hosting's base URL — they all speak at least one of this model's endpoint protocols (OPENAI_COMPATIBLE).

Capabilities

  • reasoning
  • code
  • vision
  • tool_calling

Code samples

Example using Zhipu AI — the cheapest hosting for this model as of last verification. Swap base_url and model to use a different provider from the matrix above.

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.z.ai/api/paas/v4",
)

response = client.chat.completions.create(
    model="glm-5.3-flash",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

Technical specs

Context
1000K
Max output
—
Parameters
320B
Release
—
Training cutoff
—
License
MIT
Hugging Face →Official documentation →

Similar models

Compare with

  • GLM 5.3 Flash vs Qwen3.5 397B A17B
    Comparison planned — not yet published
  • GLM 5.3 Flash vs Step 3.7 Flash
    Comparison planned — not yet published
  • GLM 5.3 Flash vs GLM 5.3 FlashX
    Comparison planned — not yet published

Frequently asked

How much does GLM 5.3 Flash cost?+
The cheapest public hosting is $0.24 per 1M blended tokens on Zhipu AI. 1 total providers are listed above with per-input / per-output / cached pricing.
How do I access GLM 5.3 Flash from outside China?+
Availability, account verification and payment methods vary by provider and region. Check the official documentation and the selected provider's access requirements before integrating. A directory listing does not guarantee global API access.
Is GLM 5.3 Flash open-source? Can I fine-tune it?+
GLM 5.3 Flash has published weights. License: MIT. Review the linked repository and license for deployment, fine-tuning and commercial-use conditions.
Is GLM 5.3 Flash OpenAI-compatible?+
At least one listed hosting exposes an OpenAI-compatible API, so you can point an existing openai SDK client at the Provider's base_url and use the Provider's model name. See the Code Samples above for a copy-pasteable example.
What's the maximum context window for GLM 5.3 Flash?+
The model supports up to 1,000,000 tokens of context (input + output). Some hosted versions may impose a smaller limit — check the "Context" column in the pricing matrix for each provider.