Tencent Hy4 Preview

tencent/hy4-preview

A chat model with a 1M-token context window, at $0.8757 per million input tokens and $2.62605 per million output tokens.

Details

Maker: tencent
Kind: Chat
Context window: 1,024,000 tokens
Max output: 64,000 tokens
Input: $0.8757 per million tokens
Cached input: $0.0441 per million tokens, 95% off
Cache write: Same as input
Output: $2.62605 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: 2026-08-28

Description

Tencent Hy4 preview is Tencent Hy’s open-source large language model, featuring 770B total parameters, 49B active parameters, and a context window exceeding 1 million tokens. Built for real-world productivity, it supports long-horizon coding, cross-document analysis, office content creation, game development, and scientific reasoning, making it well-suited to complex agents and multi-step professional workflows.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "tencent/hy4-preview",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

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

Get a key Compare with another model