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Z.ai · Open weights

GLM 5 Original Thinking

Added Feb 11, 2026Open weights

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Use in the app

GLM-5 original with extended thinking capabilities for complex reasoning.

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

Pricing

USD per 1M tokens
Input
$0.60
Output
$1.90
Cache read
$0.10

Reference prices as published by the model provider. API example

Specifications

Context window
200K
Max output
128K
Average output (7 days)
1.2K tokens
Longer than 79% of 468 models

Side by side

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TryGPT 5.2 CodexGrok Build 0.1Kimi K2.6 TEEAll 3

Public evaluations

Benchmarks

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

Intelligence Index

27.9

Better than 69% of 326 scored models

3.8Catalog models by score55.1

Document reasoning

  • AA-LCRv1.1

    75.7%

    Reasoning across long documents

    Better than 60% of 309 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    29.3%

    Expert-level questions across academic fields

    Better than 60% of 323 scored models

  • GPQA Diamond

    82.0%

    Graduate-level science questions

    Better than 51% of 291 scored models

  • IFBench

    72.3%

    Following precise output instructions

    Better than 77% of 215 scored models

Legacy evaluations

  • Terminal-Bench Hard

    43.2%

    Earlier terminal task suite

    Better than 80% of 212 scored models

  • τ²-Bench Telecom

    98.2%

    Tool use in a customer-support simulation

    Better than 95% of 214 scored models

  • AA-LCR (unversioned)

    75.7%

    Long-context reasoning, earlier grading

    Better than 60% of 309 scored models

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
65.5%
About $0.27 per 1M input tokens with caching

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.

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-5-original: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-5-original: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.