Hy4
A large language model in Tencent's Hunyuan series and the first model in the Hy series to support vision. It provides reasoning, tool calling, structured output and Computer Use capabilities, with a context window of up to 1 million tokens.
Timeline (last 90 days)
Tencent's Hy4 model has landed on AI Gateway, and developers can call it through a unified API interface.
A 1-million-token context window allows an entire codebase or multiple long documents to be placed in context at once, reducing reliance on chunked retrieval pipelines.
Hy4 offers a 50% discount on AI Gateway, with a deadline of December 31, 2026.
To upgrade from Hy4 Preview to Hy4, you only need to switch the model name to tencent/hy4.
Compared with Hy4 Preview, Hy4 has improved in three areas: instruction following, long-context performance, and stability in long-running tasks and deep research scenarios.
Hy4 supports computer use, and also supports command-line and graphical interface modes.
Hy4 has full capabilities in reasoning, tool calling and structured output.
Hy4's context window reaches 1 million tokens.
Hy4 is the first model in the Hy series to support vision capabilities.
Hy4 scored 85.4 on the Terminal-Bench benchmark.
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All Facts (19)
Hy4's activated parameters account for approximately 6.4% of its total parameter count.
60%UnverifiedHy4 supports a context window of up to 1 million (1M) tokens.
60%UnverifiedA 1-million-token context window allows an entire codebase or multiple long documents to be placed in context at once, reducing reliance on chunked retrieval pipelines.
50%UnverifiedHy4 is the first model in the Hy series to support vision capabilities.
50%UnverifiedHy4's context window reaches 1 million tokens.
50%UnverifiedHy4 has full capabilities in reasoning, tool calling and structured output.
50%UnverifiedHy4 supports computer use, and also supports command-line and graphical interface modes.
50%UnverifiedCompared with Hy4 Preview, Hy4 has improved in three areas: instruction following, long-context performance, and stability in long-running tasks and deep research scenarios.
50%UnverifiedTo upgrade from Hy4 Preview to Hy4, you only need to switch the model name to tencent/hy4.
50%UnverifiedHy4 offers a 50% discount on AI Gateway, with a deadline of December 31, 2026.
50%UnverifiedHy4 adopts a DeepSeek-style sparse attention mechanism.
50%UnverifiedHy4 is designed to handle three types of scenarios: programming development, game development, and complex document analysis.
50%UnverifiedOfficial descriptions state that Hy4 can autonomously handle three categories of scenarios: programming and development, game development, and complex document analysis.
50%UnverifiedHy4 claims to have the ability to run its own tests and fix bugs before delivery.
50%UnverifiedHy4 is categorized as an open-source and artificial intelligence project.
50%UnverifiedHy4's core positioning is long-horizon agentic tasks.
50%UnverifiedHy4 is an open-source model.
50%UnverifiedTencent's Hy4 model has landed on AI Gateway, and developers can call it through a unified API interface.
50%UnverifiedTencent released the Hy4 preview model at the end of August 2026 and open-sourced it under the Apache 2.0 license.
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