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Comparison · 2 models · Updated Oct 4, 2026

Sakana Namazu vs Seed 2.1 Pro

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. Sakana AI

    Sakana Namazu

    Released Aug 3, 2026

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

  2. 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

  3. Add a model

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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 inputsSakana Namazu: Text, Images, PDFs · Seed 2.1 Pro: Text, Images, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightSakana NamazuSeed 2.1 Pro
Price50%3938
Inputs & features30%8080
Context window20%3736
Overall100%51/10050/100

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.

Sakana Namazu vs Seed 2.1 Pro specifications side by side
SpecificationSakana NamazuSakana AISeed 2.1 ProByteDance Seed
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
Input$0.95$0.891 (best)
Output$4.00 (best)$4.45
Cached input$0.15 (best)$0.178
Blended (3:1)$1.71 (best)$1.78
Long-context rateSame rateSame rate
Price sourceOfficial Sakana AI APIOfficial Volcengine Ark API
Limits
Context window262,144 tokens (best)256,000 tokens
Max output65,536 tokens256,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesNo
AudioNoNo
VideoNoYes
ReasoningYesYesminimal · low · medium · high · xhigh · max
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDsakana-namazudoubao-seed-2-1-pro-260628
API providers5 (best)2
ReleasedAug 3, 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.

  • Sakana Namazu$17.50
  • Seed 2.1 Pro$17.81
04 — Questions

Which should you choose?

Which is better: Sakana Namazu or Seed 2.1 Pro?

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, Sakana Namazu or Seed 2.1 Pro?

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. Sakana Namazu has not been scored yet and Seed 2.1 Pro has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Sakana Namazu and Seed 2.1 Pro 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: Sakana Namazu up to 65,536, Seed 2.1 Pro up to 256,000 tokens.

Which can read images, PDFs, audio or video?

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

Are any of these open source?

No. Sakana Namazu and Seed 2.1 Pro 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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