Z.ai · Open weights
GLM 5 Original Thinking
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
GLM 5 Original Thinking compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| GLM 5 Original ThinkingZ.aiThis model | Grok Build 0.1xAIRemove | |
|---|---|---|
| Provider | Z.ai | xAI |
| Discovery tier | Open weights | Balanced |
| Added | Feb 11, 2026 | May 20, 2026 |
| Limits | ||
| Context window | 200K | 256KBest |
| Max output | 128K | — |
| Average output | 1.2K tokens | 3K tokens |
| Pricing, USD per 1M tokens | ||
| Input | $0.60Best | $1.00 |
| Output | $1.90Best | $2.00 |
| Cache read | $0.10Best | $0.20 |
| Benchmark indexes | ||
| Intelligence Index | 27.9Best | 27.2 |
| Coding Index | — | 51.5 |
| Capabilities | ||
| Reasoning | Yes | Yes |
| Tools | Yes | Yes |
| Vision | No | Yes |
| Structured output | Yes | Yes |
| Reasoning effort | — | — |
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
- GLM 5 Original Thinking
- Grok Build 0.1
Intelligence Index
- GLM 5 Original Thinking27.9
- Grok Build 0.127.2
GLM 5 Original Thinking: Better than 69% of 326 scored models
Indexes
Coding Index
Composite of the coding evaluations
- GLM 5 Original Thinking: —
- Grok Build 0.1: 51.5
Agentic work
GDPval-AAv2.1
Economically valuable occupational tasks, rated head to head
- GLM 5 Original Thinking: —
- Grok Build 0.1: 1,065 Elo
Document reasoning
AA-LCRv1.1
Reasoning across long documents
- GLM 5 Original Thinking: 75.7%Top
- Grok Build 0.1: 74.7%
Reasoning and knowledge
Humanity’s Last Exam
Expert-level questions across academic fields
- GLM 5 Original Thinking: 29.3%
- Grok Build 0.1: 38.3%Top
GPQA Diamond
Graduate-level science questions
- GLM 5 Original Thinking: 82.0%
- Grok Build 0.1: 89.5%Top
IFBench
Following precise output instructions
- GLM 5 Original Thinking: 72.3%
- Grok Build 0.1: —
Legacy evaluations
Terminal-Bench Hard
Earlier terminal task suite
- GLM 5 Original Thinking: 43.2%
- Grok Build 0.1: —
τ²-Bench Telecom
Tool use in a customer-support simulation
- GLM 5 Original Thinking: 98.2%
- Grok Build 0.1: —
AA-LCR (unversioned)
Long-context reasoning, earlier grading
- GLM 5 Original Thinking: 75.7%Top
- Grok Build 0.1: 74.7%
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
- 68.2%
- About $0.26 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.
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
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