Hy4 Preview

Name: Hy4 Preview
Author: Tencent

TencentOpen WeightsPending Human Review

Hy4 Preview is Tencent’s open-weight productivity-focused language model with 770B total parameters, 49B active per token, and a 1M-token context window. It targets code planning, debugging, office workflows, financial analysis, and research tasks that require sustained tool interactions. Tencent released weights under Apache 2.0 and made the model available through its productivity applications and inference APIs. Its preview status distinguishes this release from future Hy4 checkpoints; planned follow-up models are not assumed available. Reported improvements in internal task evaluations are provider findings rather than independent measurements.

2026-08-28

770B total, 49B active

Mixture of Experts

Apache-2.0

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Specifications

Parameters: 770B total, 49B active
Architecture: Mixture of Experts
License: Apache-2.0
Context Window: 1,048,576 tokens
Type: text
Modalities: text

Benchmark Scores

Advanced Specifications

Model Family: Hunyuan
API Access: Available
Chat Interface: Available
Variants: Hy4-preview

Capabilities & Limitations

Capabilities: reasoningcodingtool uselong context
Known Limitations: Preview release may changeLarge weight footprint requires distributed or heavily quantized servingInternal productivity evaluations are provider-specific
Notable Use Cases: software developmentoffice automationscientific research agents
Function Calling Support: Yes
Tool Use Support: Yes

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