Source: https://ailoot.ai/models/en/tencent-hy4-preview/ Canonical: https://ailoot.ai/models/en/tencent-hy4-preview/ Language: en # Tencent: Hy4 preview [Markdown](https://ailoot.ai/models/en/tencent-hy4-preview/index.md) · [JSON](https://ailoot.ai/models/en/tencent-hy4-preview/facts.json) ## [Tencent: Hy4 preview](https://ailoot.ai/models/en/tencent-hy4-preview/) Tencent Hy4 preview is a text model with a published 1,048,576-token context. Select tencent/hy4-preview through Chat Completions for work over supplied text, including document synthesis, structured extraction and code discussion. Its declared controls cover reasoning, structured responses and function-tool workflows, with complete JSON or streamed response delivery. - [**Ailoot Ultra · Chat Completions** `POST /v1/chat/completions` `tencent/hy4-preview`](https://ailoot.ai/models/en/tencent-hy4-preview/#method-0) About the model This description covers the model’s capabilities. Available in Ailoot inputs, outputs and options are listed for the selected method below. Tencent Hy4 preview is the explicitly named preview edition selected by tencent/hy4-preview. It accepts text and produces text through Chat Completions, with a published context length of 1,048,576 tokens. Prepare long material with stable document labels, section boundaries and a precise question so the request describes both the evidence to use and the result the application needs. Send POST /v1/chat/completions with model set to tencent/hy4-preview and a nonempty messages array. Supply the actual text in message content. A document-synthesis request can include labelled reports and ask for shared findings, disagreements and supporting passages. An extraction request can name fields and define how to represent missing information. A code discussion can include the relevant files or excerpts as text and ask for a focused explanation or proposed edit. Budget the instructions, documents, conversation history and requested reply within the stated context. Keep source labels beside the text they identify and state which documents govern the answer when they conflict. For a large comparison, define the criteria before the source material and request a result organised by those criteria. This gives the application a specific output to check against the input instead of relying on a broad instruction to summarise everything. The published parameter set includes reasoning, reasoning\_effort and include\_reasoning, along with temperature, stop, max\_tokens and max\_completion\_tokens. For a defined response shape, use response\_format with the schema your application expects; the profile declares structured-output support. For a function-tool exchange it includes tools and tool\_choice. Supply the schema or function definitions used by your own application, keep the selected parameter values with the request, and validate the actual returned fields or tool arguments before proceeding. The optional stream control supports assembled JSON delivery or a streamed reply. For JSON, retain every returned choice, message content, tool call, reasoning field and usage field. For streaming, join deltas by choice and tool-call index and keep the final finish information. When a tool call is returned, preserve its actual identifier and arguments so the application can associate the resulting tool message with that call. Keep the original request identity and complete response when an exchange needs investigation after an interruption. **Ailoot Ultra · Chat Completions** `POST /v1/chat/completions` `tencent/hy4-preview` [`tencent/hy4-preview`](https://ailoot.ai/models/en/#m=tencent%2Fhy4-preview&route=Ultra&caller=tencent%2Fhy4-preview&fmt=chat) Tencent /`tencent/hy4-preview` ### Overview Tencent Hy4 preview is a text model with a published 1,048,576-token context. Select tencent/hy4-preview through Chat Completions for work over supplied text, including document synthesis, structured extraction and code discussion. Its declared controls cover reasoning, structured responses and function-tool workflows, with complete JSON or streamed response delivery. Accepted inputs Text Results Text ### Available in Ailoot · inputs & methods **Ailoot Ultra · Chat Completions** `POST /v1/chat/completions` Input types `text` Output types `text` Context 1,048,576 tokens Output format JSON or supported SSE | Field | Type | Requirement | Values & limits | Default | | --- | --- | --- | --- | --- | | Field`model` | Type`string` | RequirementRequired | Values & limits tencent/hy4-preview | Default— | | Field`messages` | Type`array` | RequirementRequired | Values & limits | Default— | | Field`stream` | Type`boolean` | RequirementOptional | Values & limits | Defaultfalse | | Field`max_tokens` | Type`integer` | RequirementOptional | Values & limits Minimum: 1 | Default— | | Field`max_completion_tokens` | Type`integer` | RequirementOptional | Values & limits Minimum: 1 | Default— | | Field`n` | Type`integer` | RequirementOptional | Values & limits Minimum: 1 | Default— | | Field`temperature` | Type`number` | RequirementOptional | Values & limits | Default— | | Field`top_p` | Type`number` | RequirementOptional | Values & limits | Default— | | Field`seed` | Type`integer` | RequirementOptional | Values & limits | Default— | | Field`stop` | Type`` | RequirementOptional | Values & limits | Default— | | Field`frequency_penalty` | Type`number` | RequirementOptional | Values & limits | Default— | | Field`presence_penalty` | Type`number` | RequirementOptional | Values & limits | Default— | | Field`user` | Type`string` | RequirementOptional | Values & limits | Default— | Method parameters and lifecycle | Parameter | Contract | | --- | --- | | Parameter`content_type` | Contractapplication/json | | Parameter`required` | Contractmodel, messages | | Parameter`optional` | Contractstream, max\_tokens, max\_completion\_tokens, n, temperature, top\_p, seed, stop, frequency\_penalty, presence\_penalty, user | | Parameter`material_types` | Contracttext | | Parameter`conditions` | Contract | Lifecycle: `synchronous_json_or_sse` ### Pricing Tariff references do not add request options. Supported parameters are listed for the selected method. Fast mode Not specified When fast mode is selected Flex mode Not specified When flex mode is selected Time schedule {"periods":\[{"end\_time":"00:00","multiplier":"0.9","start\_time":"16:00"}\],"timezone":"UTC","weekdays\_only":false} At the request pricing time #### Ailoot rates #### Prices by configuration | Configuration | Rate schedule | Charge | | --- | --- | --- | | ConfigurationBase token rates | Rate scheduleBase rate | Charge Input · Input tokens **$0.001668** / 1K tokens Output · Output tokens **$0.005002** / 1K tokens Input · Cache read **$0.000084** / 1K tokens Input · Cache write **—** / 1K tokens Input · Cache write, 1 hour **—** / 1K tokens | Ailoot reserves an estimated amount before a request. After the result, it settles the final charge from measured usage. Streaming settlement uses the final usage record. [How reservation and settlement work →](https://ailoot.ai/docs/en/billing/reserve/) ### Example requests #### Ailoot Ultra · Chat Completions curl · create once and retain the complete result ```bash set -eu : "${AILOOT_API_KEY:?Set your Ailoot API key}" export AILOOT_API_KEY python3 - <<'PY_REQUEST' import json,os from pathlib import Path p=json.loads('{"model": "tencent/hy4-preview", "messages": [{"role": "user", "content": "Summarize the supplied text in three concise points."}], "stream": false}') Path("request.json").write_text(json.dumps(p,ensure_ascii=False)) PY_REQUEST curl --fail-with-body --silent --show-error https://api.ailoot.ai/v1/chat/completions \ -H "Authorization: Bearer $AILOOT_API_KEY" -H 'Content-Type: application/json' \ --data-binary @request.json -D response-headers.txt -o result.json # Submit once. Retain the complete result, original identifiers and every response header. ``` ### Receive and save results #### Ailoot Ultra · Chat Completions JSON or supported SSE ##### Keep all completed results Keep every complete returned response, file and content part. Retain the complete response, all actual results, original identifiers, usage and response headers. ##### If the original response needs checking Preserve the original response, headers and X-Client-Request-ID. An uncertain outcome does not authorize another creation. ### Aliases #### Model aliases **Ailoot Ultra** [`tencent/hy4-preview`](https://ailoot.ai/models/en/#m=tencent%2Fhy4-preview&route=Ultra&caller=tencent%2Fhy4-preview&fmt=chat) #### Method path aliases Use the method paths shown above. #### Related caller IDs [`tencent/hy4-preview`](https://ailoot.ai/models/en/#m=tencent%2Fhy4-preview&route=Ultra&caller=tencent%2Fhy4-preview&fmt=chat) FAQ · Tencent: Hy4 preview What inputs and results are available? `POST /v1/chat/completions` · `tencent/hy4-preview`: `text` → `text` Which fields does the request use? `POST /v1/chat/completions` · `tencent/hy4-preview`: `model`, `messages`, `stream`, `max_tokens`, `max_completion_tokens`, `n`, `temperature`, `top_p`, `seed`, `stop`, `frequency_penalty`, `presence_penalty`, `user` What limits apply? `POST /v1/chat/completions` · `tencent/hy4-preview`: `ctx`: `1048576`; `max_tokens.minimum`: `1`; `max_completion_tokens.minimum`: `1`; `n.minimum`: `1` Connect Ailoot to Claude Code, OpenCode, Hermes or your own app. ## The company and its project portfolio The company and its project portfolio: millions of customers; monthly sales in the billions. ## Buy tokens at a discount. Subscription discounts for regular use. Promo codes offer up to 50% off token purchases. Subscription Choose a discounted plan for your regular requests. Promo code: up to 50% off Enter your code at checkout. The price updates to reflect the current promotion. Spending in your history The model, tokens and amount are recorded for each request. [Choose a subscription](https://ailoot.ai/docs/en/billing/subscriptions/) · [View model prices](https://ailoot.ai/models/en/) ## Connect the API to a product you sell. Use Ailoot in SaaS, apps and bots under its official service offer and licence agreement. Request a reseller licence for resale. Commercial application Add text, image, video and audio generation to paid features in your service. Reseller licence Send a description of your project and how you provide access. Request written terms for use and resale. Documents on the website The service offer, licence agreement and data processing policy are available before you connect. 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