LLM models
GPT-5.6 Terra
On this page
GPT-5.6 — frontier reasoning and generation through one API.
| modelId | gpt-5-6-terra |
| Modality | text |
| Pricing | See this model on the Pricing page for the current per-call price (with your markup). |
Operations
| Operation | modelId | Endpoint | Required input |
|---|---|---|---|
| Default | gpt-5-6-terra | POST /api/v1/generate | prompt |
| Poll task | — | GET /api/v1/task/{id}?model=gpt-5-6-terra | — |
Input parameters
| Field | Type | Required | Values / example |
|---|---|---|---|
| prompt | string | Yes | Text value (example: Compare two ways to store user files for a small API: object storage with signed URLs, versus streaming through our own server. For each, give the failure mode… — full value in the request example) |
| memory | boolean | No | Automatically append previous messages to maintain multi-turn context. May increase token usage. (true/false) (default: false) |
| web_search | boolean | No | Web search feeds the results back as input tokens, so a searched turn typically costs many times a normal turn (measured: 18–87×). Billed per token as usual — nothing extra per search. (true/false) (default: true) |
| reasoning_effort | string | No | Control reasoning depth: Low for faster responses, High for deeper analysis (options: Low | Medium | High | XHigh) (default: Medium) |
| stream | boolean | No | Send true to receive the reply as an event stream (Content-Type: text/event-stream). Omit it and you get a single JSON response — streaming is opt-in on this endpoint. (true/false) (example: true) |
| images | string[] | No | Up to 4 images per message — JPEG, PNG, GIF or WebP, 5 MB each. Send each one as a data: URL or an https URL. Images are billed as input tokens. (image URL) |
| system | string | No | System instruction for the model. Defaults to "You are GPT-5.6 Terra, developed by OpenAI." when omitted. |
| messages | array | No | A conversation instead of a single `prompt`: up to 20 objects of { "role", "content" }, where role is user, assistant or system. Send `prompt` or `messages`, not both. Do not flatten a conversation into one prompt with "User:" / "Assistant:" labels — the model reads that as a single message, and a model using web search then searches for the whole block instead of your question. |
Example request
bash
curl -X POST https://you.bot/api/v1/generate \
-H "Authorization: Bearer $YOUBOT_API_KEY" \
-H "Content-Type: application/json" \
-d '{"modelId":"gpt-5-6-terra","input":{"prompt":"Compare two ways to store user files for a small API: object storage with signed URLs, versus streaming through our own server. For each, give the failure mode that bites first at scale, the cost that grows fastest, and one thing that is hard to change later. Then pick one for a service serving 10,000 files a day and say what would change your mind. Under 250 words.","memory":false,"web_search":true,"reasoning_effort":"Medium","stream":true,"images":["data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAFklEQVR4nGP8z4AATAxIHFQeMg8OAgB1yQIDpk8YwwAAAABJRU5ErkJggg=="]}}'