MODELS / Z.AI

GLM 4.5

GLM-4.5 and GLM-4.5-Air are our latest flagship models, purpose-built as foundational models for agent-oriented applications. Both leverage a Mixture-of-Experts (MoE) architecture. GLM-4.5 has a total parameter count of 355B with 32B active parameters per forward pass, while…

START BUILDING COMPARE

TEXTREASONINGREASONINGTOOL-USEIMPLICIT-CACHING

128K

CONTEXT WINDOW

96K

MAX OUTPUT TOKENS

$0.6

INPUT PRICE / 1M TOKENS

$2.20

OUTPUT PRICE / 1M TOKENS

QUICKSTART

Call it in one request.

OpenAI-compatible: change the base URL, and the setup is complete.

curl https://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/zai/glm-4.5",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ.get("BLACKBOX_API_KEY"),
    base_url="https://enterprise.blackbox.ai/v1",
)

stream = client.chat.completions.create(
    model="blackboxai/zai/glm-4.5",
    messages=[{"role": "user", "content": "Hello!"}],
    stream=True,
)

for chunk in stream:
    print(chunk.choices[0].delta.content or "", end="", flush=True)

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: process.env.BLACKBOX_API_KEY,
  baseURL: 'https://enterprise.blackbox.ai/v1',
});

const stream = await client.chat.completions.create({
  model: 'blackboxai/zai/glm-4.5',
  messages: [{ role: 'user', content: 'Hello!' }],
  stream: true,
});

for await (const chunk of stream) {
  process.stdout.write(chunk.choices[0]?.delta?.content || '');
}

SPECIFICATIONS

The full spec sheet.

Context, pricing, modalities, routing, and deployment: everything GLM 4.5 supports, in one table.

MODEL ID: blackboxai/zai/glm-4.5
DEVELOPED BY: Z.AI
MODEL TYPE: Text
RELEASED: Jul 28, 2025
CONTEXT WINDOW: 128K
MAX OUTPUT TOKENS: 96K
INPUT MODALITIES: text
OUTPUT MODALITIES: text
INPUT PRICE: $0.6 / 1M tokens
OUTPUT PRICE: $2.20 / 1M tokens
CACHE READ: $0.11 / 1M tokens
REASONING: Supported
DATA RETENTION: Standard retention
DEDICATED DEPLOYMENT: Enterprise · single-tenant
SUPPORTED PARAMETERS: max_tokenstemperaturestoptoolstool_choicereasoninginclude_reasoning

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GLM 4.5 Air

128K context · $0.2 / 1M tokens input · $1.10 / 1M tokens output

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GLM 4.5V

66K context · $0.6 / 1M tokens input · $1.80 / 1M tokens output

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GLM 4.6

200K context · $0.6 / 1M tokens input · $2.20 / 1M tokens output