Doubao-Seed-1.8 is a multimodal foundation model developed by ByteDance and optimized for autonomous task execution and real-world agency. Part of the Doubao family, the model is designed to integrate perception, reasoning, and action within a single unified architecture, moving beyond traditional conversational capabilities to function as a digital worker capable of navigating operating systems and managing complex workflows.
The model utilizes a Sparse Mixture-of-Experts (MoE) architecture and supports a context window of 256,000 tokens. It features a configurable Thinking Mode for deep reasoning, allowing the model to engage in a "chain of thought" process before producing final outputs. This capability is particularly targeted at multi-step tasks such as code architecture planning, complex mathematical reasoning, and logical puzzle solving.
Equipped with advanced multimodal perception, Doubao-Seed-1.8 can process text, image, and video inputs. It incorporates specialized visual encoding to handle long-video understanding and high-resolution imagery with reduced token consumption. For agentic applications, the model supports native GUI navigation through the User Interface Tool-Augmented Reasoning System (UI-TARS), enabling it to interact with software interfaces and web environments directly.