Seed 2.1 Turbo vs Seed Evolving
Seed 2.1 Turbo comes out ahead, 57 to 50 on our weighted score, and it is the cheaper option too.
- Our pick
ByteDance SeedSeed 2.1 Turbo
57/100- ECI—
- Price$0.445 / $2.23
- Context256K
- ByteDance Seed
Seed Evolving
50/100- ECI—
- Price$0.891 / $4.45
- Context256K
Add a model
Make it a three-way comparison.
Seed 2.1 Turbo is our pick
Seed 2.1 Turbo is the better all-round choice, scoring 57/100 against Seed Evolving (50). It leads 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 priceSeed 2.1 TurboSeed 2.1 Turbo $0.891 · Seed Evolving $1.78 per 1M tokens (3:1 blend)
- Longest contextAbout the sameSeed 2.1 Turbo 256,000 · Seed Evolving 256,000 tokens
- Widest inputsSame inputsSeed 2.1 Turbo: Text, Images, Video · Seed Evolving: Text, Images, Video
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Seed 2.1 Turbo | Seed Evolving |
|---|---|---|---|
| Price | 50% | 52 | 38 |
| Inputs & features | 30% | 80 | 80 |
| Context window | 20% | 36 | 36 |
| Overall | 100% | 57/100 | 50/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Seed 2.1 TurboByteDance Seed | Seed EvolvingByteDance Seed |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.445 (best) | $0.891 |
| Output | $2.23 (best) | $4.45 |
| Cached input | $0.089 (best) | $0.178 |
| Blended (3:1) | $0.891 (best) | $1.78 |
| Long-context rate | Same rate | Same rate |
| Price source | Official Volcengine Ark API | Official Volcengine Ark API |
| Limits | ||
| Context window | 256,000 tokens | 256,000 tokens |
| Max output | 256,000 tokens | 256,000 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | Yes | Yes |
| Reasoning | Yesminimal · low · medium · high · xhigh · max | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | doubao-seed-2-1-turbo-260628 | doubao-seed-evolving |
| API providers | 4 (best) | 2 |
| Released | Jun 23, 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.
- Seed 2.1 Turbo$8.91
- Seed Evolving$17.81
Which should you choose?
Which is better: Seed 2.1 Turbo or Seed Evolving?
Seed 2.1 Turbo is the better all-round choice, scoring 57/100 against Seed Evolving (50). It leads 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 Turbo or Seed Evolving?
Seed 2.1 Turbo is cheaper at $0.445 input / $2.23 output per million tokens (official Volcengine Ark API price). Seed Evolving 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 $0.891 per million tokens for Seed 2.1 Turbo versus $1.78 for Seed Evolving (2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Seed 2.1 Turbo 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 Turbo 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 Turbo and Seed Evolving share the same 256,000-token context window. Maximum output per response: Seed 2.1 Turbo up to 256,000, Seed Evolving up to 256,000 tokens.
Which can read images, PDFs, audio or video?
Seed 2.1 Turbo 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 Turbo and Seed Evolving are proprietary and only available through APIs and apps.
Which is newer?
Seed 2.1 Turbo 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.
