GLM 5.2 Fast

zai/glm-5.2-fast

A chat model with a 1M-token context window, at $2.94 per million input tokens and $9.24 per million output tokens.

Details

Maker: zai
Kind: Chat
Context window: 1,000,000 tokens
Max output: 128,000 tokens
Input: $2.94 per million tokens
Cached input: $0.588 per million tokens, 80% off
Cache write: Same as input
Output: $9.24 per million tokens
Capabilities: Reasoning, tool use
Takes: Text
Returns: Text
Zero data retention: Yes, on every provider
No training on requests: Yes, on every provider
Released: 2026-06-23
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-5.2-Fast-Preview is the high-speed variant of Zhipu AI's GLM-5.2, with 1M context and capabilities on par with the standard version. Inference-optimized to deliver 1.5–2× the output TPS, it fits latency-sensitive use cases such as real-time chat, multi-turn agents, and streaming code generation.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zai/glm-5.2-fast",
    "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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