Developers

GLM 5.3 API pricing

GLM 5.3 (Zhipu) is priced at $1.4 / $4.4 per 1M input / output tokens. It ranks #6 of 17 models on Somnus by blended price. With Somnus credit (2× to 2.5× on every top-up) the effective price is $0.7 / $2.2 or lower.

GLM 5.3 cost by workload

Workload	Tokens per request (in / out)	Requests	List cost	With Somnus
Support chatbot	1,500 / 500	10,000	$43.00	$21.50
Coding agent step	12,000 / 1,500	2,000	$46.80	$23.40
Document summary	8,000 / 400	1,000	$12.96	$6.48
Classification / tagging	400 / 20	100,000	$64.80	$32.40

Effective cost uses the minimum 2× credit.

How GLM 5.3 pricing works

You are charged per token: 1.4 USD per million tokens you send and 4.4 USD per million tokens GLM writes back. Output is 3.1× the input rate for GLM 5.3, so answer length drives most of the bill.

Somnus bills usage at the list price and credits every top-up at 2× or more, which is how the effective $0.7 / $2.2 rate comes about.

ModelRequests per monthInput tokens per requestOutput tokens per request

At list price

$80.00 /mo

You pay with Somnus (2× credit)

$40.00 /mo

Cheapest models for this workload

DeepSeek V4 Flash$6.60 /mo
MiMo V2.5 Pro$10.95 /mo
DeepSeek V4 Pro$19.80 /mo
Gemini 3.8 Flash$30.00 /mo
Claude Haiku 4.5$40.00 /mo

Estimate GLM 5.3 cost from the usage field

python

from openai import OpenAI
import os

client = OpenAI(
    api_key=os.environ["SOMNUS_API_KEY"],
    base_url="https://gateway-production-c837.up.railway.app/v1",
)

resp = client.chat.completions.create(
    model="claude-sonnet-5",
    messages=[
      {"role": "user", "content": "Count my tokens"}
    ],
)
print(resp.choices[0].message.content)

Multiply usage.prompt_tokens by 1.4/1e6 and usage.completion_tokens by 4.4/1e6.

Questions

How much does GLM 5.3 cost per 1M tokens?

$1.4 / $4.4 list; $0.7 / $2.2 effective with Somnus credit.

Is there a free GLM 5.3 tier?

New Somnus accounts get $5 free credit usable on GLM 5.3.

Run GLM 5.3 for less

$5 free credit, then 2×+ on every top-up.

Get an API key

Cheap GLM 5.3 API from $0.7 / $2.2 Cheap GLM API — the GLM model at half price

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