ByteDance · Single modalityReleased 2025-11-28

seedream-4.5

bytedance/seedream-4.5 id

Seedream 4.5 is the latest in-house image generation model developed by ByteDance. Compared with Seedream 4.0, it delivers comprehensive improvements—especially in editing consistency, including better preservation of subject details, lighting, and color tone. It also enhances portrait refinement and small-text rendering. The model’s multi-image composition capabilities have been significantly strengthened, and both reasoning performance and visual aesthetics continue to advance, enabling more accurate and artistically expressive image generation.

Type

Use seedream-4.5

# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'bytedance/seedream-4.5',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })

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CONTEXT WINDOW

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MAX OUTPUT

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INPUT · PER M

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OUTPUT · PER M

PRICING

List prices, every modality.

Rate	Per million tokens · USD
Input	—
Output	—
Per img	$0.0440

Honest list pricesHow we calculate prices

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Model

Input

Output

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Type

FAQ · SEEDREAM-4.5

Frequently asked

01 / 04

How do I call seedream-4.5 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘bytedance/seedream-4.5’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does seedream-4.5 cost?

Pricing varies by usage type — see the table above for the current rates.

03 / 04

What's the context window for seedream-4.5?

Context window varies — check the live spec sheet at the top of this page.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try seedream-4.5 in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

Start free Quickstart