ByteDance SeedImageReleased 23 December 2025
Seedream 4.5 pricing, context and benchmark
Seedream 4.5 is the latest in-house image generation model developed by ByteDance.
4K
Input context
n/a
Output context
$0.04
Per image
1
Providers
n/a
AA index
01 · Model Overview
Everything that matters, in one table
Context, pricing, cache, modalities and tooling, from the model registry and Artificial Analysis.
| Model | Seedream 4.5 |
| Model ID | bytedance-seed/seedream-4.5 |
| Provider | ByteDance Seed |
| Release date | 23 December 2025 |
| Status | Generally available |
| Input context | 4,096 tokens |
| Output context | Provider default |
| Official input pricing | Free per 1M tokens |
| Official output pricing | Free per 1M tokens |
| Cache read pricing | Not published |
| Market input pricing | Free per 1M (cheapest route) |
| Market output pricing | Free per 1M (cheapest route) |
| Input modalities | image · text |
| Output modalities | image |
| Reasoning control | Not exposed |
| Tool support | Text generation only |
| Tokenizer | Other |
| Provider routes | 1 endpoint |
| Artificial Analysis index | Not published |
| Speed | Not published |
| Knowledge cutoff | Not publicly stated |
Input and output support
| Modality | Input | Output | Billed at |
|---|---|---|---|
| Text | ✓ yes | no | Free in |
| Image | ✓ yes | ✓ yes | Free in |
| Audio | no | no | not supported |
| Video | no | no | not supported |
| File (PDF) | no | no | not supported |
02 · Overview
What is Seedream 4.5?
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,...
Seedream 4.5 carries a 4K token window, uses the Other tokenizer and is served by ByteDance Seed. On Hoodgen it sits in the Image tier of the model menu next to its siblings, so you can switch mid conversation without losing the thread.
03 · Release
Release and what changed from the previous version
Released23 December 2025
| Property | FLUX.2 Max | Seedream 4.5 | Change |
|---|---|---|---|
| Released | Dec 2025 | Dec 2025 | Same release window |
| Context | 47K | 4K | Changed |
| Max output | n/a | n/a | Unchanged |
| Input price | Free | Free | Unchanged |
| Output price | Free | Free | Unchanged |
| Input modalities | text, image | image, text | Unchanged |
| AA index | n/a | n/a | Newer benchmark run |
04 · Capabilities
Features and capabilities
◉
Vision
Screenshots, charts and photographed documents are read at the text token rate.
07 · Use cases
What can you do with Seedream 4.5?
Everyday writing
Drafts, rewrites, summaries and replies.
Research
Source material condensed with the key numbers kept.
Chat
General questions where latency and cost both matter.
Tooling inside Hoodgen
Writer, Humanizer, Coding and the rest of the tool suite.
09 · Pricing
Seedream 4.5 pricing
Official pricing
Per image
$0.04 / image
- Image Output: $0.04 per image
- image output from image, text input
Cheapest route
Free / 1M in
Free / 1M out
- 1 route on OpenRouter
- What Hoodgen routes to first
- Same model, lower bill
Market pricing, every route
| Provider | Tier | Input | Output | Cache read | Uptime 24h |
|---|---|---|---|---|---|
| Seed | standard | n/a | n/a | n/a | 100.0% |
API pricing and cost calculator
| Rate | Per call | Total | Credits |
|---|---|---|---|
| Cheapest route | $0.0000 | $0.00 | 1 |
| List price | $0.0000 | $0.00 | 1 |
10 · Developers
API and developer information
| Model ID | bytedance-seed/seedream-4.5 |
| Endpoint | https://openrouter.ai/api/v1/chat/completions |
| Parameters | prompt and max_tokens |
| Streaming | Yes, server sent events |
| Modality string | text+image->image |
| Max prompt tokens | 4,096 |
| Max completion tokens | provider default |
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "bytedance-seed/seedream-4.5",
"messages": [{ "role": "user", "content": "Summarise this document." }],
"max_tokens": 1024
}'11 · Limitations
Model limitations
| Output cap | Provider default tokens per request. Long deliverables have to be chunked. |
| Benchmarks not published | Artificial Analysis does not publish an Intelligence Index for this release, so no benchmark score is claimed here. |
| Knowledge cutoff | The provider does not state a fixed cutoff for every release. Verify very recent events against search. |
12 · Comparison
Seedream 4.5 vs other ByteDance Seed models
| Model | Context | Input /1M | Output /1M | AA index | Released |
|---|---|---|---|---|---|
| Seedream 4.5 | 4K | Free | Free | n/a | Dec 2025 |
| GPT Image 1 | 400K | $10 | $10 | n/a | Jun 2026 |
| GPT Image 2.6 Sunburst | 400K | $8 | $8 | n/a | Nov 2026 |
| GPT Image 2.6 Flare | 400K | $8 | $8 | n/a | Nov 2026 |
| GPT Image 2 | 400K | $8 | $8 | n/a | Jun 2026 |
| GPT Image 2.5 Flare | 400K | $8 | $8 | n/a | Sept 2026 |
13 · Privacy
Privacy and data policy
- On Hoodgen, prompts and attachments answer that request and stay in your conversation history so you can reopen it. They are not used to train models.
- Requests route through OpenRouter to ByteDance Seed and are covered by that provider's API terms.
- Do not paste secrets or personal data you would not send to any hosted model.
14 · FAQ
Seedream 4.5 questions, answered
Seedream 4.5 is a image model from ByteDance Seed, released 23 December 2025. Seedream 4.5 is the latest in-house image generation model developed by ByteDance.
✦
Start chatting with Seedream 4.5
Free to try on Hoodgen AI, with a live credit estimate before every send. No API key, no setup.