BytePlus: Seed 1.8
byteplus/seed-1-8-251228
Try Seed 1.8 for free in your browser, and add it to your app for free with Puter.js AI API.
Try it free Add to your app// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms", {
model: "byteplus/seed-1-8-251228"
}).then(response => {
document.body.innerHTML = response.message.content;
});
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain quantum computing in simple terms", {
model: "byteplus/seed-1-8-251228"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
Model Card
Seed 1.8 is ByteDance's agentic multimodal model, available here through BytePlus's Model Ark hosting.
It accepts text, image, and video input, and combines search, code, and GUI agent skills in one system. Several thinking modes, from minimal to high, let it adjust reasoning depth to the task.
ByteDance reports a score of 67.6 on BrowseComp-en for web search and 87.8 on VideoMME for long-video understanding, and says Seed 1.8 surpasses Gemini 3 Pro on BrowseComp-en.
On BytePlus, the model supports a 256,000-token context window, function calling, and video understanding across up to 1,280 extracted frames, useful for agent workflows like itinerary planning, business analysis, and multi-step task execution.
Context Window 256K
tokens
Max Output 64K
tokens
Input Cost $0.25
per million tokens
Output Cost $2
per million tokens
Input text, image, video
modalities
Tool Use Yes
Release Date Dec 28, 2025
Try Seed 1.8 for free
Try Seed 1.8 instantly in your browser.
This playground uses the Puter.js AI API — no API keys or setup required.
More AI Models From BytePlus
Dola Seed 2.1 Turbo
Dola Seed 2.1 Turbo is ByteDance's faster, lower-cost variant in the Seed 2.1 family, offered internationally through BytePlus's Model Ark platform. It accepts text, image, and video input, with a 256K context window and function calling for agent workflows. On ByteDance's own benchmarks against Claude Opus 4.7, GPT-5.5, and Gemini 3.1 Pro, Turbo scores 89 on VideoMME for long video understanding and 79.2 on OVOBench for streaming video, ahead of Gemini 3.1 Pro's 86.7 and 64.1. It scores 88.0 on BeyondAIME reasoning, above Seed 2.1 Pro's 87.0. On knowledge tests like SuperGPQA it trails GPT-5.5 and Gemini. These are vendor-reported figures, not independently verified. It suits high-volume API use such as video analysis, document processing, and agent pipelines, where cost and video handling matter more than peak coding scores.
ImageDola Seedream 5.0 Pro
Dola Seedream 5.0 Pro is ByteDance's Seedream 5.0 Pro image generation and editing model, offered here through BytePlus's ModelArk API under the "Dola" branding BytePlus uses across its hosted model lineup. It generates images as independently editable layers, separating subjects, text, and background so pieces can be repositioned or swapped after generation. It supports pixel-level editing through selection points, arrows, and annotation boxes, reads color codes and material specifications, and renders text across 14 or more languages including Arabic, Korean, Thai, French, Russian, and Japanese. On Artificial Analysis's independent Text-to-Image Elo leaderboard it scores 1,283, ranking 8th overall, ahead of Black Forest Labs' FLUX.2 Max (1,233) and just behind Google's Nano Banana Pro (1,299). It fits production teams that need layered, editable output and multilingual text rather than a single flattened image.
VideoDreamina Seedance 2.5
Dreamina Seedance 2.5 is ByteDance's newest Seedance video model, distributed under the Dreamina brand and hosted here through BytePlus. It follows Seedance 2.0, extending single-pass clips from 15 seconds to 30 seconds, with support for multi-round extension beyond that. Through this API it renders at 480p, 720p, or 1080p at 24fps, dropping the 4K tier that 2.0 offered. Reference input also grows. ByteDance says it can combine up to 50 assets in one generation call, including up to 30 images, 10 video clips, and 10 audio clips alongside a text prompt, plus native audio-video generation in a single pass and timestamp-level editing for adjusting specific segments of a clip. ByteDance also reports improved texture, lighting, and motion detail over 2.0. It suits the same production use cases as the 2.0 family, such as marketing clips and multi-shot sequences, now with longer single takes and more reference material to work from.
Frequently Asked Questions
You can access Seed 1.8 by BytePlus through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.
Seed 1.8 is free to try with a Puter account. Every account includes a free AI allowance, and you can chat with it in the playground on this page. You can upgrade your account anytime for a larger allowance.
Seed 1.8 is free to integrate using the Puter.js AI API. With the User-Pays Model, you can add AI to your app for $0, since users cover their own AI usage through their Puter account.
| Price per 1M tokens | |
|---|---|
| Input | $0.25 |
| Output | $2 |
Seed 1.8 was created by BytePlus and released on Dec 28, 2025.
Seed 1.8 supports a context window of 256K tokens. For reference, that is roughly equivalent to 512 pages of text.
Seed 1.8 can generate up to 64K tokens in a single response.
Seed 1.8 accepts the following input types: text, image, video. It produces: text.
Yes, Seed 1.8 supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.
Yes — the Seed 1.8 API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.
Add Seed 1.8 to your app for free
Developers can integrate Seed 1.8 for free using the Puter.js AI API.
With the User-Pays Model, each user covers their own AI usage instead of the developer.