GLM 5.3 Prime

What is GLM 5.3 Prime?

GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration.

Per 1M input / output tokens

$2.80 / $8.80

Starting price

Context window

1M

Up to 131K output per reply

Input

text

Output: text

What GLM 5.3 Prime can do

• Multi-step reasoning

• Tool-using agents

GLM 5.3 Prime vs similar models: price

What you pay for GLM 5.3 Prime and the models most like it: the same kind of work, from the families we feature, priced within about three times of it.

• GLM 5.3 Prime vs GPT-6.1 Sol

  GPT-6.1 Sol costs $5.40: 7% less than GLM 5.3 Prime.

  −10% at the top tier

  Compare side by side 

• GLM 5.3 Prime vs Claude Sonnet 5.5

  Claude Sonnet 5.5 costs $5.40: 7% less than GLM 5.3 Prime.

  −10% at the top tier

  Compare side by side 

• GLM 5.3 Prime vs Gemini 3.5 Flash

  Gemini 3.5 Flash costs $4.725: 19% less than GLM 5.3 Prime.

  −10% at the top tier

  Compare side by side 

• GLM 5.3 Prime vs Qwen3.8 Max

  Qwen3.8 Max costs $3.80: 34% less than GLM 5.3 Prime.

  −25% at the top tier

  Compare side by side 

• GLM 5.3 Prime vs Kimi K3

  Kimi K3 costs $9.00: 1.6× the price of GLM 5.3 Prime.

  Compare side by side 

GLM 5.3 Prime specs

The technical card for GLM 5.3 Prime, from the OceanToken catalog.

Context window

1M tokens

1,000,000

Max output

131K tokens

131,072

Input

text

Output

text

Reasoning

Yes

reasoning_effort

Tool calling

Yes

tool_choice

Structured outputs

Not listed yet

response_format

Prompt caching

Reads $0.56

official price, at every tier

GLM 5.3 Prime model ID and endpoint

OceanToken model ID

z-ai/glm-5.3-primeCopied

OpenAI-compatible base URL

https://api.oceantoken.ai/v1Copied

Endpoint

POST /v1/chat/completionsCopied

GLM 5.3 Prime API pricing

Prices come from the OceanToken catalog as of November 5, 2026. You pay per use from a prepaid balance, with no subscription.

GLM 5.3 Prime cost calculator

Pick a typical request or enter your own token counts. The calculator uses the starting prices on this page and shows the same workload on the models compared above.

At the starting price (tier 1). Cached input is billed at the cache-read price; cache writes are left out because they depend on how often your prompt prefix changes. Your console shows the rate for your tier.

What a request costs

Input and output tokens at the starting price above, with no caching.

How to use GLM 5.3 Prime on OceanToken

Three steps from no account to a working request. The same key and balance work for every model in the catalog.

1. 1

   Create an account and get an API key

   Create an OceanToken account, then create a key. One key works for every model your account can use.

   Get API Key 

2. 2

   Add credits

   OceanToken is prepaid: add credits, and each request is billed from that balance. Your console shows the rate for your tier.

   Add credits 

3. 3

   Call GLM 5.3 Prime from your code

   Point an OpenAI SDK at https://api.oceantoken.ai/v1 and use the model ID z-ai/glm-5.3-prime. The code below sends one request.

   from openai import OpenAI
   # Your API Key from the OceanToken console
   client = OpenAI(base_url="https://api.oceantoken.ai/v1",
                   api_key="YOUR_API_KEY")
   reply = client.chat.completions.create(
       model="z-ai/glm-5.3-prime",
       messages=[{"role": "user", "content": "Hello"}])
   print(reply.choices[0].message.content)

   Specs, request sample and alternatives in the docs