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Data checked September 25, 2026
Data checked September 25, 2026
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Data checked September 25, 2026 · Every number links to its sourceRSS · Source on GitHub
Leaderboard/ByteDance
ByteDance

ByteDance · Seed 2.1

Doubao Seed 2.1 Pro

Closed weightsGenerally availableproprietary

ByteDance's flagship proprietary Seed 2.1 multimodal agent/coding model (powers the Doubao app), sold via Volcano Engine in China.

AA Intelligence
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Price
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Output speed
—
Context window
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Coding

  • Terminal-Bench 2.x#34 of 103
    71%vendorTerminal-Bench 2.1ByteDance Seed: Seed2.1 model page ↗

    Leader: Claude Fable 5.1 at 91.4%

Vision and long context

  • MMMU-Pro#12 of 72
    81.6%vendorno tools (82.7 with tools)ByteDance Seed: Seed2.1 model page ↗

    Leader: Claude Opus 5.5 at 87.7%

  • Video-MME#2 of 4
    89.2%vendorByteDance Seed: Seed2.1 model page ↗

    Leader: Kimi K3 at 90%

Human preference

  • LMArena WebDev#34 of 54
    1519independentarena entry "seed-2.1-pro-preview", rank 42, 11310 votesLMArena WebDev leaderboard (fetched 2026-09-25) ↗

    Leader: Claude Opus 5.5 at 1818

Other published results

ResultScoreReported bySource
KINA48.3%vendorByteDance Seed: Seed2.1 model page ↗
SuperGPQA70.8%vendorByteDance Seed: Seed2.1 model page ↗
BeyondAIME87%vendorByteDance Seed: Seed2.1 model page ↗
Workspace Bench53%vendorByteDance Seed: Seed2.1 model page ↗
Agent Startup Bench68.8%vendorByteDance Seed: Seed2.1 model page ↗
xDailyBench61%vendorByteDance Seed: Seed2.1 model page ↗
NL2Repo-Bench47%vendorByteDance Seed: Seed2.1 model page ↗
ProgramBench50.3%vendorByteDance Seed: Seed2.1 model page ↗
SWE-Atlas35.2%vendorByteDance Seed: Seed2.1 model page ↗
MathVision (no tools)92.6%vendorByteDance Seed: Seed2.1 model page ↗
WorldVQA53%vendorByteDance Seed: Seed2.1 model page ↗
ZEROBench (no tools)18%vendorByteDance Seed: Seed2.1 model page ↗
BabyVision73.7%vendorByteDance Seed: Seed2.1 model page ↗
CharXiv-RQ (no tools)85.4%vendorByteDance Seed: Seed2.1 model page ↗
ERQA72%vendorByteDance Seed: Seed2.1 model page ↗
MMLongBench-128K78.3%vendorByteDance Seed: Seed2.1 model page ↗
TOMATO79.5%vendorByteDance Seed: Seed2.1 model page ↗
Minerva70.7%vendorByteDance Seed: Seed2.1 model page ↗
OVOBench80.7%vendorByteDance Seed: Seed2.1 model page ↗
VideoSimpleQA76.4%vendorByteDance Seed: Seed2.1 model page ↗
Code Arena: Frontend (LMArena) · Seed2.1 Preview; ranked 8th at time of blog1539 ElovendorByteDance Seed blog: Seed2.1 officially released ↗

Specs

Released
June 23, 2026
Parameters
Undisclosed
Size class
Undisclosed
Input
text, image, video
Output
text
Context
Not published
Max output
Not published

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    Compare with

    • ByteDanceDoubao Seed 2.1 Turbo
    • ByteDanceDoubao Seed 2.1 Lite
    • ByteDanceDoubao Seed Evolving
    • ByteDanceDoubao Seed 2.0 Pro