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A translucent teal seed pod splitting open around a glowing cyan core on a dark background, abstract hero artwork for Seed 2.1 Turbo

ByteDance

Seed 2.1 Turbo

ByteDance's Seed 2.1 Turbo, the fast, low-cost Seed 2.1 model for agents, coding and video understanding.

Chat with Seed 2.1 Turbo in Super AgentView pricing

What is Seed 2.1 Turbo?

Seed 2.1 Turbo is the efficient, high-throughput version of ByteDance Seed's Seed 2.1, which launched on June 23, 2026.

ByteDance pitches it as a low-cost, low-latency model for large-scale production with results on par with the launch version of Seed 2.1 Pro, suited to high-volume coding, agent and multimodal-understanding work. In ByteDance's tables, Turbo beats Claude Opus 4.7 and Gemini 3.1 Pro on MCP-Atlas, and on the MobileWorld phone-control benchmark it scores well ahead of those two and GPT-5.5. It reads text, images and video within a 256K-token context window. In Super Agent its reasoning is an on or off switch, off by default.

Provider
ByteDance
Context window
256K tokens
Input
Text, Image, Video
Reasoning
On or off
Max output
256K tokens
Released
Jun 23, 2026

How Seed 2.1 Turbo performs

Published by ByteDance

Results ByteDance reported for Seed 2.1 Turbo. Each lab runs its own setup, so compare these with other models only inside the same table.

Benchmark results ByteDance published for Seed 2.1 Turbo
BenchmarkScoreSetting
Terminal-Bench 2.167.6%
SWE-Pro Bench57.0%
OSWorld76.4%Generalist CUA, GUI plus commands and tools
MobileWorld70.0%
MCP-Atlas80.3%
BrowseComp84.9%with search
HLE-Verified42.4%no tools
MMMU-Pro80.1%no tools
VideoMME89.0%
LVBench76.8%

Source: lf3-static.bytednsdoc.com

What you can do with Seed 2.1 Turbo

  • Results on par with the launch version of Seed 2.1 Pro at lower cost and latency, per ByteDance

  • Ahead of Claude Opus 4.7 and Gemini 3.1 Pro on MCP-Atlas in ByteDance's table

  • Strong at phone and computer GUI tasks

  • Understands images and video

  • On or off reasoning switch in Super Agent

How to prompt Seed 2.1 Turbo

  • Attach a short clip and ask what happens in it before writing a new prompt from it.
  • Switch reasoning on for multi-step plans; it starts off.
  • Keep reference material compact to fit the 256K-token window.

Where Seed 2.1 Turbo fits best

  • Describing video clips and images

  • Multi-step agent tasks with tools

  • End-to-end coding from requirements to fixes

  • High-volume multimodal chat

How Seed 2.1 Turbo compares

Seed 2.1 Turbo compared with other chat models on Flashloop
ModelLMArena textLMArena codingContext windowReasoning
Seed 2.1 TurboNoNo256K tokensOn or off
GPT-6.1 Sol1480#271537#141.05M tokensLow to max
GPT-6.1 Sol ProNoNo1.05M tokensLow to max
Claude Sonnet 5.51478#291528#261M tokensLow to max
GPT-6 Luna1442#911507#651.05M tokensOff to max

Good to know before you start

  • 256K-token context, smaller than many models in Super Agent
  • Closed weights; ByteDance hasn't published its size
  • Understands video but can't generate it; Flashloop's generation models make the clips

Start chatting with Seed 2.1 Turbo

Chat with Seed 2.1 Turbo in Super Agent

  1. Select Seed 2.1 Turbo

    Open Super Agent on Flashloop and choose Seed 2.1 Turbo in the model picker.

  2. Enter your prompt

    Ask for what you need: an answer, a plan, or the images and videos you want the agent to make.

  3. Send and keep going

    Send the message. Seed 2.1 Turbo answers in Super Agent and runs any generations you asked for.

Questions about Seed 2.1 Turbo

Who makes Seed 2.1 Turbo?

ByteDance, through its Seed team. Turbo is the high-throughput sibling of Seed 2.1 Pro.

Can Seed 2.1 Turbo understand video?

Yes. It reads text, images and video, and ByteDance reports strong scores on video benchmarks such as VideoMME.

How does reasoning work on Seed 2.1 Turbo in Super Agent?

It is an on or off switch, and Super Agent starts it with reasoning off.

What context window does Seed 2.1 Turbo have?

256K tokens, with up to 256K tokens of output.

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