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Bytedance Seed 1.8

Bytedance Seed 1.8 is ByteDance's generalized agentic model. It combines a Search Agent, Code Agent, and GUI Agent in one multimodal system with token-efficient visual encoding and three adaptive thinking modes.

ReasoningVision (Image)Implicit Cachingtiered-cost
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'bytedance/seed-1.8',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • What does "generalized agentic model" mean for Bytedance Seed 1.8?

    It completes multi-step tasks autonomously across search, code, and graphical interfaces. It covers all three instead of specializing in one capability.

  • How does the GUI Agent in Bytedance Seed 1.8 work without traditional scripted automation?

    It uses native vision to interpret screenshots and decide which actions to take: clicks, keystrokes, and form entries. It adapts to any UI layout without pre-defined selectors or automation scripts.

  • What is the BrowseComp-en benchmark and why is Bytedance Seed 1.8's score notable?

    BrowseComp-en tests retrieval and synthesis through web browsing in English. Bytedance Seed 1.8 scores 67.6 in ByteDance's published table. See https://docs.byteplus.com/en/docs/ModelArk/2123228 for the full benchmark context.

  • How does token-efficient visual encoding benefit agentic applications?

    Each GUI observation step sends one or more screenshots to the model. Fewer tokens per image means more steps fit within the context window at lower cost. This is especially important for long automation sessions with many intermediate observations.

  • Does Bytedance Seed 1.8 support video understanding in addition to image inputs?

    Yes. Bytedance Seed 1.8 scores 87.8 on VideoMME (long-form video understanding) in ByteDance's published results. It processes temporal sequences of visual content alongside text instructions.

  • What kinds of real-world workflows was Bytedance Seed 1.8 evaluated on?

    Evaluations cover simulated practical scenarios including travel planning, financial and business analysis, software engineering tasks, and multi-step information retrieval.

  • Is Bytedance Seed 1.8 accessible without setting up a Volcano Engine account?

    Yes. Through AI Gateway, you authenticate with an API key or OIDC token and route requests to Bytedance Seed 1.8. You don't need a separate Volcano Engine account.