Is Hy4 preview available on FastMetal?

Not at the moment. GLM 5.3 Flash, from the same lab, is available on the FastMetal API today.

What is the context window of Hy4 preview?

1,048,576 tokens, shared between the prompt and the response.

How does Hy4 preview rank?

#0 on the public arena's Overall board (ELO 1,633). Ranks move as the leaderboard is updated.

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tencent/hy4-preview

Not Available

Hy4 preview

Tencent: Hy4 preview is a mixture-of-experts model from Tencent, with 49B active parameters out of 770B total. It is designed for coding agents, complex tool-use workflows, and productivity tasks that...

8/28/2026

1,048,576 tokens

#0 Code (Overall)

Specifications

Modalities

Input

text

Output

text

Supported Parameters

include_reasoning

max_completion_tokens

max_tokens

reasoning

reasoning_effort

response_format

stop

structured_outputs

temperature

tool_choice

tools

Max Output Tokens

64,000

Frequently asked questions

Is Hy4 preview available on FastMetal?: Not at the moment. GLM 5.3 Flash, from the same lab, is available on the FastMetal API today.
What is the context window of Hy4 preview?: 1,048,576 tokens, shared between the prompt and the response.
How does Hy4 preview rank?: #0 on the public arena's Overall board (ELO 1,633). Ranks move as the leaderboard is updated.

Leaderboard

Code

OverallELO: 1,633

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