HY4

HY4 foundation intelligence model.

Run HY4

Included on PRO plan

Context Window

128K

128K tokens

Input Token Price

$0.83

per 1,000,000 tokens

Output Token Price

$2.50

per 1,000,000 tokens

Speed Rating

High-speed

High-speed (~90-120 tps)

Architectural Profile & Capabilities

HY4 is available on ARMES with Zero Data Retention privacy guarantees.

Architecture Type: Dense Transformer

ARMES Zero Data Retention

Calls to HY4 are routed through strict Zero Data Retention inference channels. Prompts and outputs are never stored, indexed, or monitored by Tencent.

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View Roster (3)

Hy4 PreviewEco Tier

Hy4 preview (tencent/hy4-preview) is Tencent Hy Team's open-weight, 770B-total / 49B-active Mixture-of-Experts flagship (Apache 2.0, released Aug 28, 2026) built for long-horizon coding agents, complex tool-use workflows, and productivity tasks, backed by a 1,048,576-token context window and DeepSeek-style sparse attention.

1.05M ctx$0.83/M

Hy3Free Tier

GPQA Diamond: 90.4%, HLE: 53.2%, BrowseComp: 84.2% (beats DeepSeek V4-Pro 83.4 & Opus 4.7 79.3; ~ties GPT-5.5 84.4), DeepSearchQA: 91.0, MCP-Atlas: 79.1 (beats Opus 4.7's 77.3), Terminal-Bench 2.1: 71.7% (beats Opus 4.7 & DeepSeek V4-Pro), SWE-bench Verified: 78.0%, GSM8K: 95.37%, MATH: 76.28%, Factual hallucination rate: 5.4% (down from 12.5% in preview), MRCR long-dialogue: 75.1% (up from 42.9%) | Grounded factual Q&A and RAG (trained to answer when grounded and flag missing evidence rather than fabricate), web-browsing/research agents, multi-step tool orchestration, customer-support and long multi-turn dialogue (coreference resolution, constraint tracking across turns), professional document generation, focused coding tasks.

256K ctx$0.20/M