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Tencent: Hy4 Preview
tencent/hy4-previewtextReasoning
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 work needing planning, context continuity, and multi-step execution. 1M context.
Price in / out
Cache, read / write
Context / Max output
1.05M / 64K
Released
Aug 28, 2026
Parameters
messagesrequiredreasoning_effortoff · low · medium · highmax_tokensoptional · alias max_completion_tokensstreamtrue · falsetoolsfunction calling (OpenAI format)tool_choiceauto · none · requiredresponse_formatjson_object · json_schemaweb_search · · · providerrouting: order · only · ignore · sortstream_options{"include_usage": true}Fine-tuning · 2
temperature0–2stopoptionalHow to use via API
from openai import OpenAI
client = OpenAI(base_url="https://api.mixen.ai/v1", api_key="mxn-...")
resp = client.chat.completions.create(
model="tencent/hy4-preview",
messages=[{"role": "user", "content": "Привет"}],
reasoning_effort="low", # off · low · medium · high
temperature=0.7,
max_tokens=1024,
stream=False,
)
print(resp.choices[0].message.content)
# Стриминг: stream=True — ответ приходит чанками
for chunk in client.chat.completions.create(
model="tencent/hy4-preview",
messages=[{"role": "user", "content": "Привет"}],
stream=True,
):
print(chunk.choices[0].delta.content or "", end="", flush=True)
