# Doubao Seedream 4.5

Model id on AIHubMix: `doubao-seedream-4-5`
Create an API key: https://console.aihubmix.com/

> Seedream 4.5 is ByteDance's latest multimodal image model, integrating capabilities such as text-to-image, image-to-image, and multi-image output, along with incorporating common sense and reasoning abilities. Compared to the previous 4.0 model, it significantly improves generation quality, offering better editing consistency and multi-image fusion effects, with more precise control over image details. The generation of small text and small faces is more natural.

- Developer: Doubao
- Input modalities: text, image
- Pricing: per-generation — see https://aihubmix.com/model/doubao-seedream-4-5

## Endpoints (base URL: https://aihubmix.com)

- `POST /ai/v1/images/generations` — image generation (`Authorization: Bearer $AIHUBMIX_API_KEY`)
- `POST /v1/images/edits` — image generation (`Authorization: Bearer $AIHUBMIX_API_KEY`)
- `POST /v1/images/generations` — image generation (`Authorization: Bearer $AIHUBMIX_API_KEY`)

## Example

```bash
curl -s https://aihubmix.com/ai/v1/images/generations \
  -H "Authorization: Bearer $AIHUBMIX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"doubao-seedream-4-5","prompt":"<your prompt>"}'
```

The response carries the output URL(s) directly. Full parameter list: see the schema link below. Generation costs real money — check the price on the model page first.

## Parameters (image endpoint)

| name | type | required | default | enum |
|---|---|---|---|---|
| `aspect_ratio` | string,null | no |  | 16:9, 9:16, 1:1, 4:3, 3:4, 3:2, … |
| `async` | boolean | no | false |  |
| `extra` | object,null | no |  |  |
| `image` | - | no |  |  |
| `images` | array,null | no |  |  |
| `model` | string | yes |  |  |
| `n` | integer,null | no | 1 |  |
| `prompt` | string | yes |  |  |
| `response_format` | string,null | no | "url" | url, b64_json, null |
| `seed` | integer,null | no |  |  |
| `size` | string,null | no |  |  |
| `webhook_events_filter` | array<string> | no |  |  |
| `webhook_url` | string | no |  |  |

Always-current parameter schema (authoritative, no auth):

```bash
curl -s https://aihubmix.com/call/schema/models/doubao-seedream-4-5/endpoints
```

Output URLs are short-lived (roughly 30 minutes) and are downloaded with the same `Authorization: Bearer` header — fetch them promptly and store the content yourself.

## Errors

Error responses carry a `tid` (trace id) — include it when contacting support. Reference: https://docs.aihubmix.com/en/FAQs/HTTP-Codes.md

- 400 — parameter error; most are passed through from the upstream provider (media: `prompt_missing`, `size_not_supported`, `n_not_within_range`, …)
- 401 — missing `Authorization` header, or the key is invalid/expired
- 403 — `insufficient_user_quota` (top up at https://console.aihubmix.com/), account suspended, or this key is not allowed to use this model
- 429 — rate limited; back off and retry
- 503 — no channel can serve the request (check the model id and your access), or the upstream provider is throttling; retry later

## More

- Machine-readable endpoint schema (no auth): https://aihubmix.com/call/schema/models/doubao-seedream-4-5/endpoints
- Async task guide: https://docs.aihubmix.com/en/api/async-tasks.md
- Model page: https://aihubmix.com/model/doubao-seedream-4-5
- Try in browser: https://playground.aihubmix.com/?model=doubao-seedream-4-5
- Compare with another model (human-facing, side-by-side specs and pricing): https://aihubmix.com/compare/doubao-seedream-4-5/{other_model_id}
- Generate runnable code programmatically: npm `@aihubmix/codegen` — the generator behind the Playground's "Get Code" (4 protocols × 7 languages, media endpoints included); the body it builds is the exact wire body the Playground sends, so generated snippets and real requests cannot diverge. `@aihubmix/model-schema` (npm) translates the parameter schema above into codegen input
- Site index for agents: https://aihubmix.com/llms.txt · Onboarding: https://aihubmix.com/agents.md

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Canonical version of this document: https://aihubmix.com/model/doubao-seedream-4-5/llms.txt