Seed 2.1 Pro (2026-06-28)

No priced offering is listed for this model yet.

Max thinking budget

256K

Family

seed-pro

Not stated on ByteDance Seed’s pages: max input, built-in tools, knowledge cutoff, aliases.

• Epoch AI · Chess Puzzles 21%

  #58 of 85 listed models · high effort · ±4.09

• Epoch AI · GPQA Diamond 89.3%

  #48 of 168 listed models · high effort · ±1.84

• Epoch AI · OTIS Mock AIME 2024–2025 95.6%

  #36 of 159 listed models · high effort · ±2.92

• Epoch AI · SimpleQA Verified 44.7%

  #41 of 84 listed models · high effort · ±1.57

• Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Nov 4 – 5, 2026
• changes we made

1. Oct 12, 2026 New language model

• 模型发布公告 - 火山方舟 - 火山引擎in Chinese (opens in a new tab) docs.volcengine.com · checked Nov 9, 2026
• Doubao-Seed-2.1 series (opens in a new tab) ark.volcengine.com · checked Nov 7, 2026
• models.dev: doubao-seed-2-1-pro-260628 (community data, MIT) (opens in a new tab) github.com · checked Oct 12, 2026
• 火山方舟：模型列表in Chinese (opens in a new tab) docs.volcengine.com · checked Nov 8, 2026
• 模型列表 - 火山方舟 - 火山引擎in Chinese (opens in a new tab) docs.volcengine.com · checked Nov 11, 2026
• 模型支持的参数列表--火山方舟-火山引擎in Chinese (opens in a new tab) docs.volcengine.com · checked Nov 9, 2026

ByteDance Seed’s official policies: data use, privacy, terms →

Some values on this page are still waiting to be checked against official pages: a filled dot is verified, a hollow one is not yet (with or without a source on file). How we verify data

ByteDance Seed · China · seed.bytedance.com

Snapshots, the same family and other models from this provider

• Seed 2.1 Pro
• Seed 2.1 Pro (2026-09-15)
• Seed 2.0 Pro
• Seed 2.0 Pro (2026-02-15)
• seed-2-0-lite-260428 LTS
• Seed 2.1 Lite
• Seed 2.1 Lite (2026-09-15)
• Seed 2.1 Turbo