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Comparison · 2 models · Updated Oct 4, 2026

Seed 2.1 Pro vs Sakana Namazu

Too close to call on our weighted score (Sakana Namazu 51, Seed 2.1 Pro 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. Sakana AI

    Sakana Namazu

    Released Aug 3, 2026

    51/100
    • ECI—
    • Price$0.95 / $4.00
    • Context262K
    Full specs Remove Sakana Namazu

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Too close to call

It is close. Our weighted score puts them within a point (Sakana Namazu 51/100, Seed 2.1 Pro 50/100), so choose by what matters most for your work: Sakana Namazu on price and Sakana Namazu for long inputs. 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 priceSakana NamazuSakana Namazu $1.71 · Seed 2.1 Pro $1.78 per 1M tokens (3:1 blend)
  • Longest contextSakana NamazuSakana Namazu 262,144 · Seed 2.1 Pro 256,000 tokens
  • Widest inputsSame inputsSeed 2.1 Pro: Text, Images, Video · Sakana Namazu: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightSeed 2.1 ProSakana Namazu
Price50%3839
Inputs & features30%8080
Context window20%3637
Overall100%50/10051/100

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 Sakana Namazu specifications side by side
SpecificationSeed 2.1 ProByteDance SeedSakana NamazuSakana AI
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
Input$0.891 (best)$0.95
Output$4.45$4.00 (best)
Cached input$0.178$0.15 (best)
Blended (3:1)$1.78$1.71 (best)
Long-context rateSame rateSame rate
Price sourceOfficial Volcengine Ark APIOfficial Sakana AI API
Limits
Context window256,000 tokens262,144 tokens (best)
Max output256,000 tokens (best)65,536 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoNo
VideoYesNo
ReasoningYesminimal · low · medium · high · xhigh · maxYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDdoubao-seed-2-1-pro-260628sakana-namazu
API providers25 (best)
ReleasedJun 23, 2026Aug 3, 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
  • Sakana Namazu$17.50
04 — Questions

Which should you choose?

Which is better: Seed 2.1 Pro or Sakana Namazu?

It is close. Our weighted score puts them within a point (Sakana Namazu 51/100, Seed 2.1 Pro 50/100), so choose by what matters most for your work: Sakana Namazu on price and Sakana Namazu for long inputs. 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 Sakana Namazu?

Sakana Namazu is cheaper at $0.95 input / $4.00 output per million tokens (official Sakana AI API price). Seed 2.1 Pro costs $0.891 input / $4.45 output per million tokens (official Volcengine Ark API price). At a typical mix of three input tokens to one output token, that is $1.71 per million tokens for Sakana Namazu versus $1.78 for Seed 2.1 Pro (1× as much).

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 Sakana Namazu has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Seed 2.1 Pro and Sakana Namazu 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?

Sakana Namazu has the largest context window at 262,144 tokens, against 256,000 for Seed 2.1 Pro. Maximum output per response: Seed 2.1 Pro up to 256,000, Sakana Namazu up to 65,536 tokens.

Which can read images, PDFs, audio or video?

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

Are any of these open source?

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

Which is newer?

Sakana Namazu is the newest, released Aug 3, 2026. Seed 2.1 Pro 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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