NOUMENOpen app
NOUMEN

Z.ai · Open weights

GLM 4.5 Air (Thinking)

Added Jan 1, 2024Open weights

Compare models

Choose up to 3 models to compare.1 of 3 chosen

Loading models…

Use in the app

GLM-4.5-Air with thinking mode enabled for enhanced reasoning capabilities. Shows step-by-step thought process.

  • Reasoning
  • Tools
  • Structured output
Input
Text
Output
Text
Discovery tier
Open weights

Pricing

USD per 1M tokens
Input
$0.13
Output
$0.85
Cache read
$0.025

Reference prices as published by the model provider. API example

Specifications

Context window
128K
Max output
98.3K
Average output (7 days)
973 tokens
Longer than 70% of 465 models

Side by side

GLM 4.5 Air (Thinking) compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

Compare models

Choose up to 3 models to compare.1 of 3 chosen

Loading models…

GLM 4.5 Air (Thinking)Z.aiThis modelGLM 4 Air 0111Z.aiRemove
ProviderZ.aiZ.ai
Discovery tierOpen weightsEfficient
AddedJan 1, 2024Jan 11, 2025
Limits
Context window128K128K
Max output98.3KBest4.1K
Average output973 tokens69 tokens
Pricing, USD per 1M tokens
Input$0.13Best$0.14
Output$0.85$0.14Best
Cache read$0.025—
Performance
Request success (24h)100.0%—
Benchmark indexes
Intelligence Index11.1—
Math Index80.7—
Capabilities
ReasoningYesNo
ToolsYesNo
Structured outputYesNo
Reasoning effort——

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • GLM 4.5 Air (Thinking)
  • GLM 4 Air 0111

Intelligence Index

  • GLM 4.5 Air (Thinking)11.1
  • GLM 4 Air 0111—

GLM 4.5 Air (Thinking): Better than 23% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Math Index

    Composite of the math evaluations

    • GLM 4.5 Air (Thinking): 80.7
    • GLM 4 Air 0111: —

Document reasoning

  • AA-LCRv1.1

    Reasoning across long documents

    • GLM 4.5 Air (Thinking): 46.7%
    • GLM 4 Air 0111: —

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GLM 4.5 Air (Thinking): 7.0%
    • GLM 4 Air 0111: —

  • GPQA Diamond

    Graduate-level science questions

    • GLM 4.5 Air (Thinking): 73.3%
    • GLM 4 Air 0111: —

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • GLM 4.5 Air (Thinking): 81.5%
    • GLM 4 Air 0111: —

  • IFBench

    Following precise output instructions

    • GLM 4.5 Air (Thinking): 37.6%
    • GLM 4 Air 0111: —

Coding

  • LiveCodeBench

    Recent competitive programming problems

    • GLM 4.5 Air (Thinking): 68.4%
    • GLM 4 Air 0111: —

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • GLM 4.5 Air (Thinking): 80.7%
    • GLM 4 Air 0111: —

  • AIME

    Competition mathematics

    • GLM 4.5 Air (Thinking): 67.3%
    • GLM 4 Air 0111: —

  • MATH-500

    Competition math problems

    • GLM 4.5 Air (Thinking): 96.5%
    • GLM 4 Air 0111: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • GLM 4.5 Air (Thinking): 20.5%
    • GLM 4 Air 0111: —

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • GLM 4.5 Air (Thinking): 46.5%
    • GLM 4 Air 0111: —

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GLM 4.5 Air (Thinking): 46.7%
    • GLM 4 Air 0111: —

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Prompt cache hits
36.0%
About $0.0922 per 1M input tokens with caching
Request success (24h)
100.0%
Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 100.0%
  • Healthy (98% or more)
  • Degraded (90–98%)
  • Down (under 90%)
  • No requests

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/GLM-4.5-Air:thinking",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="z-ai/GLM-4.5-Air:thinking",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

Z.ai

Other Z.ai models, starting with the same family.