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Comparison · 2 models · Updated Oct 4, 2026

Seed 2.1 Pro vs Seed Evolving

Too close to call on our weighted score (Seed 2.1 Pro 50, Seed Evolving 50). The right pick depends on what you value most.

  1. ByteDance Seed

    Seed 2.1 Pro

    Released Jun 23, 2026

    50/100
    • ECI—
    • Price$0.891 / $4.45
    • Context256K
    Full specs Remove Seed 2.1 Pro

  2. ByteDance Seed

    Seed Evolving

    Released Jun 23, 2026

    50/100
    • ECI—
    • Price$0.891 / $4.45
    • Context256K
    Full specs Remove Seed Evolving

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within a point (Seed 2.1 Pro 50/100, Seed Evolving 50/100), so choose by what matters most for your work: Seed 2.1 Pro on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

  • CapabilityNot enough dataNo independent benchmark covers every model here yet
  • Lowest priceSame priceSeed 2.1 Pro $1.78 · Seed Evolving $1.78 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameSeed 2.1 Pro 256,000 · Seed Evolving 256,000 tokens
  • Widest inputsSame inputsSeed 2.1 Pro: Text, Images, Video · Seed Evolving: Text, Images, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightSeed 2.1 ProSeed Evolving
Price50%3838
Inputs & features30%8080
Context window20%3636
Overall100%50/10050/100

Left out because at least one model lacks the data: capability. The remaining weights were rescaled.

02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Seed 2.1 Pro vs Seed Evolving specifications side by side
SpecificationSeed 2.1 ProByteDance SeedSeed EvolvingByteDance Seed
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
Input$0.891$0.891
Output$4.45$4.45
Cached input$0.178$0.178
Blended (3:1)$1.78$1.78
Long-context rateSame rateSame rate
Price sourceOfficial Volcengine Ark APIOfficial Volcengine Ark API
Limits
Context window256,000 tokens256,000 tokens
Max output256,000 tokens256,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoNo
AudioNoNo
VideoYesYes
ReasoningYesminimal · low · medium · high · xhigh · maxYesminimal · low · medium · high · xhigh · max
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDdoubao-seed-2-1-pro-260628doubao-seed-evolving
API providers22
ReleasedJun 23, 2026Jun 23, 2026
Knowledge cutoff——
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Seed 2.1 Pro$17.81
  • Seed Evolving$17.81
04 — Questions

Which should you choose?

Which is better: Seed 2.1 Pro or Seed Evolving?

It is close. Our weighted score puts them within a point (Seed 2.1 Pro 50/100, Seed Evolving 50/100), so choose by what matters most for your work: Seed 2.1 Pro on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

Which is cheaper, Seed 2.1 Pro or Seed Evolving?

Seed 2.1 Pro and Seed Evolving cost the same: $0.891 input / $4.45 output per million tokens.

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. Seed 2.1 Pro has not been scored yet and Seed Evolving has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Seed 2.1 Pro and Seed Evolving yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.

Which has the bigger context window?

Seed 2.1 Pro and Seed Evolving share the same 256,000-token context window. Maximum output per response: Seed 2.1 Pro up to 256,000, Seed Evolving up to 256,000 tokens.

Which can read images, PDFs, audio or video?

Seed 2.1 Pro accepts text, images and video; Seed Evolving accepts text, images and video. They handle the same number of input types.

Are any of these open source?

No. Seed 2.1 Pro and Seed Evolving are proprietary and only available through APIs and apps.

Which is newer?

Seed 2.1 Pro is the newest, released Jun 23, 2026. Seed Evolving came out Jun 23, 2026.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

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