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Bytedance Seed: Seed 2.1 Pro

Flagship ByteDance Seed 2.1 model for complex multimodal reasoning, coding, and agents

Source-linked seed Closed weights Released 2026-06-23
API record Report
InputT
OutputT
Input price$0.884/M
Output price$4.42/M
Context256K
Max output256K
Providers1
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

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Providers offering Seed 2.1 Pro
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
Ofox volcengine/doubao-seed-2.1-pro 256K 256K $0.884 $4.42 $0.177 ReasoningTools Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $0.884/M

Across 1 priced provider

Median input $0.884/M

Midpoint of listed rates

Highest input $0.884/M

Same as the lowest listed rate

Output range $4.42 – $4.42

Per million output tokens

Ofox $0.884/MLowest
Cost calculator

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Excludes taxes, non-token charges, and tiered discounts.
Specification

Capabilities

Recorded from the source catalog and provider listings.

✓ Reasoning Yes
✓ Tool calling Yes
? Structured output Unknown
✓ Attachments Yes
✓ Vision input Yes
× Open weights No
Model family
seed
Knowledge cutoff
Not documented
License
Not documented
Release date
2026-06-23
Model ID
bytedance-seed/seed-2.1-pro
Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
No published benchmark results

ModelBench does not infer quality from price, context size, or model name. When a source publishes a comparable result, it appears here with its version and link.

Read the methodology
Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
No changes recorded

This record has not changed within the retained import history.

Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://www.modelbench.lol/api/v1/models/bytedance-seed/seed-2.1-pro
curl
curl "https://www.modelbench.lol/api/v1/models/bytedance-seed/seed-2.1-pro"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is Seed 2.1 Pro?

Flagship ByteDance Seed 2.1 model for complex multimodal reasoning, coding, and agents. It is published by Bytedance Seed and catalogued here from Models.dev.

How much does Seed 2.1 Pro cost?

Listed input pricing starts at $0.884 per million tokens from Ofox.

What is the context length of Seed 2.1 Pro?

Seed 2.1 Pro accepts up to 256K tokens of context and returns up to 256K output tokens.

Does Seed 2.1 Pro support tool calling and structured output?

Provider catalogs list support for tool calling, reasoning, and image input.

Which providers serve Seed 2.1 Pro?

1 provider list this model: Ofox.

Are the weights for Seed 2.1 Pro open?

No. This model is served through hosted APIs only.

When was Seed 2.1 Pro released?

The catalog records a release date of 2026-06-23, last verified Aug 17, 2026.

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