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GLM 5.3

zai/glm-5.3

A chat model with a 1M-token context window, at $1.47 per million input tokens and $4.62 per million output tokens.

Details

Maker
zai
Kind
Chat
Context window
1,000,000 tokens
Max output
1,000,000 tokens
Input
$1.47 per million tokens
Cached input
$0.147 per million tokens, 90% off
Cache write
Same as input
Output
$4.62 per million tokens
Capabilities
Reasoning, tool use
Takes
Text
Returns
Text
Zero data retention
Not on every provider
No training on requests
Not on every provider
Released
2026-08-18
Newer model
zai/glm-5.3-flashxReleased later by the same maker, costs no more, and lists the same capabilities. Compare the two

Description

GLM 5.3 delivers comprehensive advancements in complex software engineering and agent capabilities. It uses the same base model as GLM-5.2, with all improvements driven by post-training.

Call it

curl
curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zai/glm-5.3",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Set PHANTOM_KEY to your key. Any OpenAI client works with the base URL https://phantom.codes/v1.

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