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. By Z.ai, on GridPup at $0.18 per million input tokens and $0.60 per million output tokens, paid from your GridPup balance per request. No subscription.

Try it in the Playground Get an API key

Price

Made by: Z.ai
Input: $0.18 per million tokens
Output: $0.60 per million tokens
Context: 1.048576M tokens
Can: Tools, Reasoning, JSON, Reads images

What it costs, roughly
A 1,000-word answer to a 200-word question	$0.00085
1,000 such answers	$0.85
Summarising a 50-page document (25,000 words) in 500 words	$0.0064

Use it from your code

GridPup's API speaks OpenAI's format: use any OpenAI SDK with the base URL https://api.gridpup.com/v1/ai and a GridPup API key with Also use AI models. The answer tells you what it cost. More in the API docs.

from openai import OpenAI

client = OpenAI(base_url="https://api.gridpup.com/v1/ai", api_key="gp_live_…")

r = client.chat.completions.create(
    model="@cf/zai-org/glm-5.3-flash",
    messages=[{"role": "user", "content": "Explain a KV cache in two sentences."}],
)
print(r.choices[0].message.content)
print("cost:", r.usage.cost_usd, "USD")

Questions

How much does GLM 5.3 Flash cost?: $0.18 per million input tokens and $0.60 per million output tokens, charged per request from your prepaid balance. You need a small balance to start ($1 for most models); there is no monthly fee.
Who runs it?: Z.ai made GLM 5.3 Flash. GridPup serves it through Cloudflare's AI Gateway, so you use it with one GridPup balance instead of an account with Z.ai.
Does it work with the OpenAI SDK?: Yes: set base_url to https://api.gridpup.com/v1/ai and the model to @cf/zai-org/glm-5.3-flash.

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