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Model garden Router · on request Dedicated · available

GLM 5.3 Flash BF16

Runs as your own dedicated GPU deployment, ready to launch from the wizard. 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...

Start for free ← All models
zai-org/GLM-5.3-Flash-BF16 On request
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
772GB
Minimum VRAM
POST /api/v1/chat/completions On request

Specifications

Parameters 321B
Context window 1,048,576 tokens
Minimum VRAM 772 GB
Architecture Glm5NextForConditionalGeneration (vLLM)
License mit
Modality text+image->text
Released August 2026
Publisher zai-org ↗

Pricing

Shared router · per token
On request
Not available on the shared router. Pricing on request as a dedicated GPU deployment.
Prefer per token on the shared router? This model runs always-on as GLM 5.3 Flash.
Dedicated GPU · per hour
from €49,52 per hour
Your own vLLM instance on European cloud (772 GB VRAM), billed hourly.

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

Bench index

Bench is our quality index for every model, 0 to 100. It rests on the Epoch AI Capabilities Index (about 40 benchmarks), completed with LiveBench, and is refreshed every morning.

73.4 / 100 · Via LiveBench

Translated from its LiveBench result onto the same scale.

Range 67.1 to 79.7

Sources: Epoch AI ↗ · LiveBench ↗ · LMArena ↗ · Refreshed daily, last on 25-09-2026

LiveBench · 71.6 · Rank 49 of 63
Reasoning 77.6
Coding 79.0
Agentic coding 56.8
Mathematics 81.2
Data analysis 76.4
Language 77.3
Instruction following 52.8
LiveBench · All tasks
Reasoning
theory of mind 73.1
zebra puzzle 79.5
spatial 96.0
logic with navigation 62.0
Coding
code generation 77.5
code completion 80.4
Agentic coding
javascript 63.6
typescript 46.7
python 60.0
Mathematics
AMPS Hard 97.0
integrals with game 45.0
math comp 93.1
olympiad 89.8
Data analysis
consecutive events 84.3
tablejoin 48.8
tablereformat 96.1
Language
connections 93.7
plot unscrambling 60.3
typos 78.0
Instruction following
paraphrase 48.0
simplify 47.0
story generation 59.9
summarize 56.5

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-BF16",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Frequently asked questions

Can I run GLM 5.3 Flash BF16 in the EU?

Yes. HostYourAI runs GLM 5.3 Flash BF16 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 BF16 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 BF16 cost?

GLM 5.3 Flash BF16 is available on request: through the shared EU router after a quick chat, or as your own dedicated GPU deployment billed per hour. Tell us your use case and we will set it up for you.

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.

More models from Z.AI

GLM 5.3 Flash

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 and agentic benchmarks.

321B 1M context View model →
GLM 5.3

GLM-5.3 uses the same base model as GLM-5.2 — every gain comes from post-training. Compared with GLM-5.2, it is much better at complex coding and long-horizon tasks:

753B 1M context View model →
GLM 5.2

We're introducing GLM-5.2, our latest flagship model for long-horizon tasks. It marks a substantial leap in long-horizon task capability over its predecessor GLM-5.1 and, for the first time, delivers that capability on a solid 1M-token context. GLM-5.2's new capabilities include: - Solid 1M Context: A solid 1M-token context that stably sustains long-horizon work - Advanced Coding with Flexible Effort: Stronger coding capabilities with multiple thinking effort levels to balance performance and latency - Improved Architecture: We propose IndexShare, which reuses the same indexer across every fou

753B 1M context View model →
GLM 5.1

GLM-5.1 is our next-generation flagship model for agentic engineering, with significantly stronger coding capabilities than its predecessor. It achieves state-of-the-art performance on SWE-Bench Pro and leads GLM-5 by a wide margin on NL2Repo (repo generation) and Terminal-Bench 2.0 (real-world terminal tasks).

754B 203K context View model →
GLM 5

We are launching GLM-5, targeting complex systems engineering and long-horizon agentic tasks. Scaling is still one of the most important ways to improve the intelligence efficiency of Artificial General Intelligence (AGI). Compared to GLM-4.5, GLM-5 scales from 355B parameters (32B active) to 744B parameters (40B active), and increases pre-training data from 23T to 28.5T tokens. GLM-5 also integrates DeepSeek Sparse Attention (DSA), largely reducing deployment cost while preserving long-context capacity.

754B 203K context View model →
GLM 4.7 Flash

GLM-4.7-Flash is a 30B-A3B MoE model. As the strongest model in the 30B class, GLM-4.7-Flash offers a new option for lightweight deployment that balances performance and efficiency.

31B 203K context View model →

Try GLM 5.3 Flash BF16 for free

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