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ByteDance

Seed 2.1 Pro

Seed 2.1 Pro is a reasoning model from ByteDance in the Seed 2.1 family. 9 benchmarks count toward its index, in 4 categories.

  • Closed weights
  • Reasoning
  • Input: text
  • Released 2026-06
RankedEnough results for an index.
IndexAll categories, out of 100.60.1±8.9Median 51.0
CoverageIndex weight that has results.65%
SpeedOutput tokens per second.—Median 67/s
First tokenSeconds to the first output token.—Median 1.3 s
Input / 1MUS dollars per 1M input tokens.—Median $0.60
Output / 1MUS dollars per 1M output tokens.—Median $2.55
ContextMaximum tokens in one request.256KMedian 262K
EloLMArena rating and rank.—Median 1422

Capabilities

Index per category, out of 100.
Out of 100
AgenticMulti-step tasks with tools.1 counted62.7—
CodingCode writing and repair.1 counted59.9—
ReasoningLogic problems and puzzles.None counted——
MultimodalTasks with images and text.6 counted62.734 / 84
KnowledgeFacts and expert knowledge.1 counted55.2—
MultilingualTasks in many languages.None counted——
InstructionTasks with strict prompt rules.None counted——
MathMath problems.None counted——

Results

9 counted
BenchmarkThe benchmark name.ResultThe score from the source.PlacePlace among results on this benchmark.
Massive Multi-discipline Multimodal Understanding ProMultimodal81.6%7 / 53
MathVisionMultimodal92.6%4 / 24
ERQAMultimodal72.0%3 / 18
SuperGPQA: Scaling LLM Evaluation Across 285 Graduate DisciplinesKnowledge70.8%7 / 22
BabyVisionMultimodal73.7%4 / 11
CharXiv ReasoningMultimodal85.4%19 / 49
NL2RepoCoding47.0%18 / 36
Terminal-Bench 2.1 · BenchLMAgentic71.0%49 / 86
ZeroBenchMultimodal18.0%9 / 10
Video-MMEMultimodal89.2%—

Sources

BenchLMCC BY-NC 4.0

History

5 releases
Index61.3 → 60.1
23 Oct 202612 Nov 2026

Questions

How good is Seed 2.1 Pro?
Its index is 60.1 out of 100. That is place 73 of 283 ranked models.
What is Seed 2.1 Pro best at?
Multimodal: 62.7 out of 100, place 34 of 84.
What is the context window of Seed 2.1 Pro?
256K tokens.
Is Seed 2.1 Pro open source?
No. Its weights are not published.
When was Seed 2.1 Pro released?
June 2026.

Badge

Seed 2.1 Pro on Inference360: place 73 of 283, index 60.1
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<a href="https://inference360.ai/models/seed-2-1-pro"><img src="https://inference360.ai/badges/seed-2-1-pro.svg" alt="Seed 2.1 Pro on Inference360: place 73 of 283, index 60.1" height="20"></a>
Markdown
[![Seed 2.1 Pro on Inference360: place 73 of 283, index 60.1](https://inference360.ai/badges/seed-2-1-pro.svg)](https://inference360.ai/models/seed-2-1-pro)

Compare with

Seed 2.1 Turbo57.4

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