GLM 5.3 FlashX

What is GLM 5.3 FlashX?

GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds of up to 200 tokens/s.

Per 1M input / output tokens

$0.37 / $1.25

Starting price

Context window

1.05M

Up to 131K output per reply

Input

text + image + video

Output: text

What GLM 5.3 FlashX can do

• Multi-step reasoning

• Tool-using agents

• Image understanding

• Video understanding

GLM 5.3 FlashX vs similar models: price

What you pay for GLM 5.3 FlashX 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 FlashX vs DeepSeek V4.1 Flash (1017)

  DeepSeek V4.1 Flash (1017) costs $0.525: 35% less than GLM 5.3 FlashX.

  −40% at the top tier

  Compare side by side 

• GLM 5.3 FlashX vs Qwen3.8 Flash

  Qwen3.8 Flash costs $0.295: 64% less than GLM 5.3 FlashX.

  −25% at the top tier

  Compare side by side 

• GLM 5.3 FlashX vs GPT-6 Luna

  GPT-6 Luna costs $0.27: 67% less than GLM 5.3 FlashX.

  −10% at the top tier

  GPT-6 Luna API 

• GLM 5.3 FlashX vs Gemini 3.8 Flash

  Gemini 3.8 Flash costs $2.025: 2.5× the price of GLM 5.3 FlashX.

  −10% at the top tier

  Compare side by side 

• GLM 5.3 FlashX vs MiniMax M3

  MiniMax M3 costs $0.75: 7% less than GLM 5.3 FlashX.

  Compare side by side 

GLM 5.3 FlashX specs

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

Context window

1.05M tokens

1,048,576

Max output

131K tokens

131,072

Input

text, image, video

Output

text

Reasoning

Yes

reasoning_effort

Tool calling

Yes

tool_choice

Structured outputs

Not listed yet

response_format

Prompt caching

Reads $0.09

official price, at every tier

GLM 5.3 FlashX model ID and endpoint

OceanToken model ID

z-ai/glm-5.3-flashxCopied

OpenAI-compatible base URL

https://api.oceantoken.ai/v1Copied

Endpoint

POST /v1/chat/completionsCopied

GLM 5.3 FlashX 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 FlashX 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 FlashX 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 FlashX from your code

   Point an OpenAI SDK at https://api.oceantoken.ai/v1 and use the model ID z-ai/glm-5.3-flashx. 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-flashx",
       messages=[{"role": "user", "content": "Hello"}])
   print(reply.choices[0].message.content)

   Specs, request sample and alternatives in the docs