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GLM 5.3 Flash

Instantly via the EU router or as a dedicated GPU deployment. Data stays in Europe.

We introduce GLM-5.3-Flash, the first natively multimodal model in the GLM-5 series. With 320B total parameters and just 18B active parameters, it outperforms GLM-5.2 across benchmarks and real-world workloads at one-tenth the price, while approaching Claude Opus 4.8 on coding an...

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zai-org/GLM-5.3-Flash
text+image->text · zai-org · sovereign EU
Runs on EU infrastructure operated by European companies; US marketplace capacity is never part of this chain. Full chain
321B
Parameters
1,049K
Context window
394GB
Minimum VRAM
POST /api/v1/chat/completions 200 OK

Specifications

Parameters 321B
Context window 1,048,576 tokens
Minimum VRAM 394 GB
Architecture Glm5NextForConditionalGeneration (vLLM)
License mit
Modality text+image->text
Released August 2026
Publisher zai-org ↗

Pricing

Shared router · per token
€0.23
Input (per 1M tokens)
€0.58
Output (per 1M tokens)
€0.06 per million cached input tokens
Dedicated GPU · per hour
from €21,48 per hour
Your own vLLM instance on European cloud (394 GB VRAM), billed hourly.

Shared EU router, pay-per-token, scale-to-zero. Dedicated GPU deployments are billed hourly, see pricing.

Call it now

Drop-in replacement for OpenAI: change only the base URL and API key. The Anthropic format (/v1/messages) is supported too.

curl https://hostyourai.com/api/v1/chat/completions \
  -H "Authorization: Bearer hyai-..." \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zai-org/GLM-5.3-Flash",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Frequently asked questions

Can I run GLM 5.3 Flash in the EU?

Yes. HostYourAI runs GLM 5.3 Flash on GPUs in European datacenters via vLLM. Prompts and outputs never leave the EU and there is no US cloud provider in the chain.

Is hosting GLM 5.3 Flash GDPR-compliant?

Yes. All processing happens inside the EU, a Data Processing Agreement (DPA) is available and the subprocessor list is public. Open-source weights also mean: no training on your data.

How much does GLM 5.3 Flash cost?

Via the shared EU router you pay €0.23 per million input tokens and €0.58 per million output tokens, with no fixed costs. For high volume or isolation you can also run GLM 5.3 Flash as a dedicated hourly GPU instance.

Is the API OpenAI-compatible?

Yes. You use the standard OpenAI SDKs with a custom base URL (https://hostyourai.com/api/v1). The Anthropic Messages API is supported as a drop-in as well.

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