ByteDance: Doubao-Seed-2.1-turbo API

A new-generation model balancing quality and cost, with across-the-board upgrades to coding, agent and multimodal capabilities — stronger self-planning, long-horizon execution and dynamic self-repair, aimed at production at scale.

Context window: 262,144 tokens
Max output: 262,144 tokens
Input: text, image, video
Output: text
Reasoning: Supported
Tool calling: Supported
File input: Supported
Released: 2026-06-27

Frequently Asked Questions

What is the context window of Doubao-Seed-2.1-turbo?

Doubao-Seed-2.1-turbo supports a context window of up to 262,144 tokens.

Does Doubao-Seed-2.1-turbo support function calling?

Yes. Doubao-Seed-2.1-turbo supports tool / function calling.

Does Doubao-Seed-2.1-turbo support reasoning?

Yes. Doubao-Seed-2.1-turbo is a reasoning-capable model.