Seed 2.1 Turbo: Specifications & Sources

Profile

Specifications and access

Published information about this model. Existing estimates are explicitly labeled.

Dated documentation and model-card observations. Provider limits, native context and extended context can differ. Configuration notes retain the source wording.

Specification	Value and source
Weights	ProprietarySource
Access	APISource
Context window	256,000 tokensSource
Notes	Current Seed 2.1 model with an accelerated API variant; parameter count is not published.Source
Release	2026-06-23Source
License	proprietary BytePlus termsSource
API model ID	seed-2-1-turboSource
Input	Text, Image, VideoSource
Output	TextSource

Measurements without matching peer values

These measurements have no matching peer values under the same test conditions. Their original values and sources remain available here.

Agent Startup Bench (Show measurement, test conditions, and source)

Source value: 54
Score: 54
Metric: percent
Unit: %
Category: high-economic-value
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:0
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

BabyVision (Show measurement, test conditions, and source)

Source value: 62.9
Score: 62.9
Metric: percent
Unit: %
Category: perception
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:1
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

BeyondAIME (Show measurement, test conditions, and source)

Source value: 88
Score: 88
Metric: percent
Unit: %
Category: reasoning
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:2
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

CharXiv-RQ (w. Tool) (Show measurement, test conditions, and source)

Source value: 82.5
Score: 82.5
Metric: percent
Unit: %
Category: infographics
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:3
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

ERQA (Show measurement, test conditions, and source)

Source value: 71.3
Score: 71.3
Metric: percent
Unit: %
Category: spatial-reasoning
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:4
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

KINA (Show measurement, test conditions, and source)

Source value: 46.6
Score: 46.6
Metric: percent
Unit: %
Category: knowledge
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:5
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

MMLongBench-128K (Show measurement, test conditions, and source)

Source value: 76.9
Score: 76.9
Metric: percent
Unit: %
Category: multimodal-long-context
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:6
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

MMMU-Pro (w. Tool) (Show measurement, test conditions, and source)

Source value: 80.1
Score: 80.1
Metric: percent
Unit: %
Category: multimodal-STEM
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:7
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

MathVision (w. Tool) (Show measurement, test conditions, and source)

Source value: 90.1
Score: 90.1
Metric: percent
Unit: %
Category: multimodal-reasoning
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:8
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

Minerva (Show measurement, test conditions, and source)

Source value: 65.9
Score: 65.9
Metric: percent
Unit: %
Category: video-reasoning
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:9
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

NL2Repo-Bench (Show measurement, test conditions, and source)

Source value: 43.7
Score: 43.7
Metric: percent
Unit: %
Category: coding
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:10
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

OVOBench (Show measurement, test conditions, and source)

Source value: 79.2
Score: 79.2
Metric: percent
Unit: %
Category: streaming
Direction: Higher is better
Comparison cohort: research:seed-2.1-turbo:11
Source type: vendor-reported
Evaluator: ByteDance Seed official benchmark table
Status: active
Retrieved at: 2026-09-08
Methodology: Vendor-reported result. Seed2.1 Turbo column

Source ByteDance Seed official benchmark table

Page 1 of 2

Our model tests

Our tests

Compare how the models respond to the same prompt. Each test shows the latest attempt, with no subsequent fixes to the generated code. Earlier runs remain available in the test details. These results do not contribute to an overall score.

Pelican on a bicycle

A community classic for free-form SVG drawing.

Seed 2.1 Turbo

The response reached the token limit. No complete recording is available.

Reasoning (requested): high

Current attempt

Run date: 2 Oct 2026
API provider: openrouter
Requested API model: bytedance-seed/seed-2-1-turbo
API model reported in response: bytedance-seed/seed-2-1-turbo
Reasoning setting: high
Pinned endpoint: Seed | bytedance-seed/seed-2-1-turbo-20260810
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Failed
Response time: 128.3 s

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

Earlier attempts (1)

1 Oct 2026API request failedReasoning setting: high

Prompt and test conditions

Generate an SVG of a pelican riding a bicycle

Token limit including reasoning: 8,192 tokens

Task origin (Simon Willison)

Popularity

17.3 / 100

Pricing

Published prices

Prices apply to the stated unit. Resolution, output length, and provider can change the cost.

API input: $0.5 per 1M tokensSource
API output: $2.5 per 1M tokensSource
Cache read: $0.1 per 1M tokensSource

Evidence

Sources and data date

Every statement links to its underlying documentation or leaderboard.

Type	Evidence and data date
Price	Base API prices without caching or batch discounts. Higher context tiers and other rates are listed under Costs. Source: Pricing · API pricing · BytePlus model access and pricing · Editorial description reviewed October 2, 2026
Input	Documented modalities. Retrieved September 8, 2026. Source: Model documentation · ByteDance Seed official benchmark table (retrieved September 8, 2026)
Output	Documented modalities. Retrieved September 8, 2026. Source: Model documentation · ByteDance Seed official benchmark table (retrieved September 8, 2026)
Research status	Research date September 8, 2026. 3 source URLs checked. This documents the inspected sources, not an exhaustive inventory of every publication.
Not found in the inspected sources	parameters-billions Original wording No exact value located in the checked primary model card/API documentation.
Not found in the inspected sources	active-parameters-billions Original wording No exact value located in the checked primary model card/API documentation.
Not found in the inspected sources	knowledge-cutoff Original wording No exact value located in the checked primary model card/API documentation.
Unresolved	AA benchmark rows Original wording No exact Artificial Analysis model page located in the checked public sitemap.
Additional source	Model metadata
Additional source	ByteDance Seed 2.1 release · Editorial description reviewed October 2, 2026
Additional source	ByteDance Seed 2.1 model page · Editorial description reviewed October 2, 2026
Additional source	OpenRouter: Popularity index (derived), CC BY 4.0
Additional source	Vercel AI Gateway: Popularity index (derived), CC BY 4.0
Additional source	Creative Commons Attribution 4.0