Fugu vs Seed 2.1 Pro
Fugu comes out ahead, 66 to 62 on our weighted score.
- Our pick
Sakana AI
Fugu
66/100- ECI—
- Price—
- Context1M
ByteDance SeedSeed 2.1 Pro
62/100- ECI—
- Price$0.891 / $4.45
- Context256K
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Make it a three-way comparison.
Fugu is our pick
Fugu is the better all-round choice, scoring 66/100 against Seed 2.1 Pro (62). It leads on context window. Seed 2.1 Pro wins on inputs & features. The score weighs inputs & features 60%, context window 40%. 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 priceSeed 2.1 ProSeed 2.1 Pro $1.78 per 1M tokens (3:1 blend) · Fugu unpriced
- Longest contextFuguFugu 1,000,000 · Seed 2.1 Pro 256,000 tokens
- Widest inputsSeed 2.1 ProFugu: Text, Images · Seed 2.1 Pro: Text, Images, Video
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Fugu | Seed 2.1 Pro |
|---|---|---|---|
| Inputs & features | 60% | 70 | 80 |
| Context window | 40% | 60 | 36 |
| Overall | 100% | 66/100 | 62/100 |
Left out because at least one model lacks the data: capability and price. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | FuguSakana AI | Seed 2.1 ProByteDance Seed |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | — | $0.891 |
| Output | — | $4.45 |
| Cached input | — | $0.178 |
| Blended (3:1) | — | $1.78 |
| Long-context rate | — | Same rate |
| Price source | — | Official Volcengine Ark API |
| Limits | ||
| Context window | 1,000,000 tokens (best) | 256,000 tokens |
| Max output | — | 256,000 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | Yes |
| Reasoning | Yeshigh · xhigh | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | fugu | doubao-seed-2-1-pro-260628 |
| API providers | 1 | 2 (best) |
| Released | Jun 15, 2026 | Jun 23, 2026 |
| Knowledge cutoff | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Fugu—
- Seed 2.1 Pro$17.81
Which should you choose?
Which is better: Fugu or Seed 2.1 Pro?
Fugu is the better all-round choice, scoring 66/100 against Seed 2.1 Pro (62). It leads on context window. Seed 2.1 Pro wins on inputs & features. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Fugu or Seed 2.1 Pro?
Seed 2.1 Pro is cheaper at $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 $1.78 per million tokens for Seed 2.1 Pro versus . Fugu has no published per-token price.
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Fugu 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 Fugu 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?
Fugu has the largest context window at 1,000,000 tokens, against 256,000 for Seed 2.1 Pro. Maximum output per response: Seed 2.1 Pro up to 256,000 tokens.
Which can read images, PDFs, audio or video?
Fugu accepts text and images; Seed 2.1 Pro accepts text, images and video. Seed 2.1 Pro handles the widest range of inputs.
Are any of these open source?
No. Fugu and Seed 2.1 Pro are proprietary and only available through APIs and apps.
Which is newer?
Seed 2.1 Pro is the newest, released Jun 23, 2026. Fugu came out Jun 15, 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.
