Seed 2.1 Turbo vs Qwen3.5 122B-A10B
Too close to call on our weighted score (Qwen3.5 122B-A10B 58, Seed 2.1 Turbo 57). The right pick depends on what you value most.
ByteDance SeedSeed 2.1 Turbo
57/100- ECI—
- Price$0.445 / $2.23
- Context256K
Alibaba (Qwen)Qwen3.5 122B-A10B
58/100- ECI—
- Price$0.40 / $3.20
- Context262K
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Make it a three-way comparison.
Too close to call
It is close. Our weighted score puts them within a point (Qwen3.5 122B-A10B 58/100, Seed 2.1 Turbo 57/100), so choose by what matters most for your work: Seed 2.1 Turbo on price and Qwen3.5 122B-A10B 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 priceSeed 2.1 TurboSeed 2.1 Turbo $0.891 · Qwen3.5 122B-A10B $1.10 per 1M tokens (3:1 blend)
- Longest contextQwen3.5 122B-A10BQwen3.5 122B-A10B 262,144 · Seed 2.1 Turbo 256,000 tokens
- Widest inputsQwen3.5 122B-A10BSeed 2.1 Turbo: Text, Images, Video · Qwen3.5 122B-A10B: Text, Images, Audio, Video
- Self-hostingQwen3.5 122B-A10BPublishes downloadable weights
| Measure | Weight | Seed 2.1 Turbo | Qwen3.5 122B-A10B |
|---|---|---|---|
| Price | 50% | 52 | 48 |
| Inputs & features | 30% | 80 | 90 |
| Context window | 20% | 36 | 37 |
| Overall | 100% | 57/100 | 58/100 |
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 | Qwen3.5 122B-A10BAlibaba (Qwen) |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.445 | $0.40 (best) |
| Output | $2.23 (best) | $3.20 |
| Cached input | $0.089 | — |
| Blended (3:1) | $0.891 (best) | $1.10 |
| Long-context rate | Same rate | Same rate |
| Price source | Official Volcengine Ark API | Official Alibaba API |
| Limits | ||
| Context window | 256,000 tokens | 262,144 tokens (best) |
| Max output | 256,000 tokens (best) | 65,536 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | Yes |
| Video | Yes | Yes |
| Reasoning | Yesminimal · low · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | doubao-seed-2-1-turbo-260628 | qwen3.5-122b-a10b |
| API providers | 4 | 19 (best) |
| Released | Jun 23, 2026 | Feb 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
- Qwen3.5 122B-A10B$10.40
Which should you choose?
Which is better: Seed 2.1 Turbo or Qwen3.5 122B-A10B?
It is close. Our weighted score puts them within a point (Qwen3.5 122B-A10B 58/100, Seed 2.1 Turbo 57/100), so choose by what matters most for your work: Seed 2.1 Turbo on price and Qwen3.5 122B-A10B 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 Turbo or Qwen3.5 122B-A10B?
Seed 2.1 Turbo is cheaper at $0.445 input / $2.23 output per million tokens (official Volcengine Ark API price). Qwen3.5 122B-A10B costs $0.40 input / $3.20 output per million tokens (official Alibaba 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 $1.10 for Qwen3.5 122B-A10B (1.2× 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 Qwen3.5 122B-A10B has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Seed 2.1 Turbo and Qwen3.5 122B-A10B 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?
Qwen3.5 122B-A10B has the largest context window at 262,144 tokens, against 256,000 for Seed 2.1 Turbo. Maximum output per response: Seed 2.1 Turbo up to 256,000, Qwen3.5 122B-A10B up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Seed 2.1 Turbo accepts text, images and video; Qwen3.5 122B-A10B accepts text, images, audio and video. Qwen3.5 122B-A10B handles the widest range of inputs.
Are any of these open source?
Qwen3.5 122B-A10B publishes its weights and can be self-hosted; Seed 2.1 Turbo is proprietary.
Which is newer?
Seed 2.1 Turbo is the newest, released Jun 23, 2026. Qwen3.5 122B-A10B came out Feb 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.
