Identity
- Status
- preview
- Developer ID
tencent/Hy4-preview- Released
- Aug 28, 2026
- Version
- Hy4 preview
- License
- apache-2.0
TencentHy4 preview
Hy4 preview is Tencent's open-weight flagship mixture-of-experts language model with 770B total parameters, 49B active parameters, and a 1M-token context window.
- Context
- 1,000,000 tokens
- Inputs
- Text
- Outputs
- Text
- Released
- Aug 28, 2026
Providers & Pricing
Estimate workload cost →| Provider | Input / 1M | Output / 1M | Cache read / 1M | Cache write / 1M | Observed | Evidence |
|---|---|---|---|---|---|---|
 OpenrouterAvailable | $0.834 | $2.501 | $0.042 | — | Sep 2, 2026 | Provider-reported |
At a Glance
Model Facts
Capacity
- Context
- 1,000,000 tokens
- Maximum output
- Unknown
- Total parameters
- 770,000,000,000
- Active parameters
- 49,000,000,000
- Knowledge cutoff
- Not reported
Interface and Access
- Inputs
- Text
- Outputs
- Text
- API available
- No
- Open weights
- Yes
- Self-hostable
- Yes
- Reasoning
- Yes
- Vision
- No
- Tool calling
- Yes
- Capabilities
- chat, generation, reasoning, tools
This page represents one immutable developer model ID. Serving endpoints, pricing, regions, quantizations, and service tiers attach separately and never create duplicate model records.
Version Lineage
PredecessorUnknown
SuccessorsUnknown
Aliaseshy4-preview, Hy4 preview, tencent/Hy4-preview, tencent/Hy4-preview-FP8
Explicit Unknowns
- Maximum output
- Tokenizer
- Knowledge cutoff
Primary Evidence
Sources and Observation Date
Comparable Peers
Related Model Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Hy4 previewTencent | vs | Hy3Tencent | family variantstext |
Hy4 previewTencent | vs | Claude Fable 5.1Anthropic | cross-developer peerstext |
Hy4 previewTencent | vs |  GPT-5.6 SolOpenAI | cross-developer peerstext |
Hy4 previewTencent | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Hy4 previewTencent | vs |  DeepSeek-V4-ProDeepSeek | cross-developer peerstext |
Hy4 previewTencent | vs | cross-developer peerstext | |
Hy4 previewTencent | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Hy4 previewTencent | vs |  Kimi-K3Moonshot AI | cross-developer peerstext |
Hy4 previewTencent | vs |  MiniMax-M3MiniMax | cross-developer peerstext |
Hy4 previewTencent | vs | cross-developer peerstext | |
Hy4 previewTencent | vs |  Mistral Large 3Mistral AI | cross-developer peerstext |
Hy4 previewTencent | vs |  ERNIE 5.1Baidu | cross-developer peerstext |
Questions
Hy4 preview FAQs
What is Hy4 preview?+
Hy4 preview is Tencent's open-weight flagship mixture-of-experts language model with 770B total parameters, 49B active parameters, and a 1M-token context window. It is developed by Tencent and its current sourced lifecycle status is preview.
What inputs and outputs does Hy4 preview support?+
Hy4 preview's current record lists Text as input and Text as output.
How much context does Hy4 preview support?+
The current record lists a 1,000,000-token context window and does not report a maximum output length.
Is Hy4 preview available through an API?+
Hy4 preview is explicitly marked as not API-available in the current record.
How large is Hy4 preview?+
The current record lists 770,000,000,000 total parameters and 49,000,000,000 active parameters. Its architecture is mixture_of_experts.
What capabilities and tasks does Hy4 preview support?+
Hy4 preview's recorded capabilities are chat, generation, reasoning, and tools. Its supported tasks are reasoning and text.
How much does Hy4 preview cost through an API?+
The lowest directly sourced prices currently attached to Hy4 preview are $0.834 per million input tokens through Openrouter and $2.501 per million output tokens through Openrouter. Prices are provider-specific and should be checked against each cited observation date.
Can Hy4 preview be self-hosted?+
Hy4 preview is an open-weight model. Self-hosting is supported, and the recorded license is apache-2.0.
Does Hy4 preview have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are hy4-preview, Hy4 preview, tencent/Hy4-preview, and tencent/Hy4-preview-FP8.
Which models can Hy4 preview be compared with?+
The current compatible peer set includes Hy3, Claude Fable 5.1, GPT-5.6 Sol, Gemini 3.1 Pro, and DeepSeek-V4-Pro. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →