MODELS / Z.AI

GLM 5.3 Flash

GLM-5.3-Flash is Z.ai’s native multimodal coding model, featuring 320B total parameters, 18B activated parameters, and a 1M-token context window. Its efficient hybrid attention architecture supports visual coding, tool use, and end-to-end professional workflows across code,…

TEXTREASONINGREASONINGTOOL-USEIMPLICIT-CACHINGVISION
1M
CONTEXT WINDOW
131K
MAX OUTPUT TOKENS
$0.075
INPUT PRICE / 1M TOKENS
$0.25
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-5.3-flash",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
SPECIFICATIONS

The full spec sheet.

Context, pricing, modalities, routing, and deployment: everything GLM 5.3 Flash supports, in one table.

MODEL ID
blackboxai/zai/glm-5.3-flash
DEVELOPED BY
Z.AI
MODEL TYPE
Text
RELEASED
Aug 26, 2026
CONTEXT WINDOW
1M
MAX OUTPUT TOKENS
131K
INPUT MODALITIES
text, image
OUTPUT MODALITIES
text
INPUT PRICE
$0.075 / 1M tokens
OUTPUT PRICE
$0.25 / 1M tokens
CACHE READ
$0.015 / 1M tokens
REASONING
Supported
DATA RETENTION
Standard retention
DEDICATED DEPLOYMENT
Enterprise · single-tenant
SUPPORTED PARAMETERS
max_tokenstemperaturestoptoolstool_choicereasoninginclude_reasoning