Aion-3.0-Mini vs Qwen3.5 27B vs Seed 2.1 Turbo
Too close to call on our weighted score (Qwen3.5 27B 57, Seed 2.1 Turbo 56, Aion-3.0-Mini 41). The right pick depends on what you value most.
Aion Labs
Aion-3.0-Mini
41/100- ECI—
- Price$0.70 / $1.40
- Context131K
Alibaba (Qwen)Qwen3.5 27B
57/100- ECI—
- Price$0.30 / $2.40
- Context262K
ByteDance SeedSeed 2.1 Turbo
56/100- ECI—
- Price$0.445 / $2.23
- Context256K
Too close to call
It is close. Our weighted score puts them within a point (Qwen3.5 27B 57/100, Seed 2.1 Turbo 56/100, Aion-3.0-Mini 41/100), so choose by what matters most for your work: Qwen3.5 27B on price and Qwen3.5 27B 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 priceQwen3.5 27BQwen3.5 27B $0.825 · Aion-3.0-Mini $0.875 · Seed 2.1 Turbo $0.891 per 1M tokens (3:1 blend)
- Longest contextQwen3.5 27BQwen3.5 27B 262,144 · Seed 2.1 Turbo 256,000 · Aion-3.0-Mini 131,072 tokens
- Widest inputsQwen3.5 27B and Seed 2.1 TurboAion-3.0-Mini: Text · Qwen3.5 27B: Text, Images, Video · Seed 2.1 Turbo: Text, Images, Video
- Self-hostingQwen3.5 27BPublishes downloadable weights
| Measure | Weight | Aion-3.0-Mini | Qwen3.5 27B | Seed 2.1 Turbo |
|---|---|---|---|---|
| Price | 50% | 50 | 52 | 50 |
| Inputs & features | 30% | 35 | 80 | 80 |
| Context window | 20% | 25 | 37 | 36 |
| Overall | 100% | 41/100 | 57/100 | 56/100 |
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 | Aion-3.0-MiniAion Labs | Qwen3.5 27BAlibaba (Qwen) | Seed 2.1 TurboByteDance Seed |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.70 | $0.30 (best) | $0.445 |
| Output | $1.40 (best) | $2.40 | $2.23 |
| Cached input | — | — | $0.089 |
| Blended (3:1) | $0.875 | $0.825 (best) | $0.891 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 4 providers | Official Alibaba API | Official Volcengine Ark API |
| Limits | |||
| Context window | 131,072 tokens | 262,144 tokens (best) | 256,000 tokens |
| Max output | 32,768 tokens | 65,536 tokens | 256,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | Yes | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | Yes | Yes |
| Reasoning | Yes | Yes | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Open | Proprietary |
| API model ID | — | qwen3.5-27b | doubao-seed-2-1-turbo-260628 |
| API providers | 4 | 19 (best) | 8 |
| Released | May 14, 2026 | Feb 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.
- Aion-3.0-Mini$9.80
- Qwen3.5 27B$7.80
- Seed 2.1 Turbo$8.91
Which should you choose?
Which is better: Aion-3.0-Mini, Qwen3.5 27B or Seed 2.1 Turbo?
It is close. Our weighted score puts them within a point (Qwen3.5 27B 57/100, Seed 2.1 Turbo 56/100, Aion-3.0-Mini 41/100), so choose by what matters most for your work: Qwen3.5 27B on price and Qwen3.5 27B 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, Aion-3.0-Mini, Qwen3.5 27B or Seed 2.1 Turbo?
Qwen3.5 27B is cheaper at $0.30 input / $2.40 output per million tokens (official Alibaba API price). Aion-3.0-Mini costs $0.70 input / $1.40 output per million tokens (median across 4 API providers); Seed 2.1 Turbo costs $0.445 input / $2.23 output per million tokens (official Volcengine Ark API price). At a typical mix of three input tokens to one output token, that is $0.825 per million tokens for Qwen3.5 27B versus $0.875 for Aion-3.0-Mini (1.1× as much) and $0.891 for Seed 2.1 Turbo (1.1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Aion-3.0-Mini has not been scored yet, Qwen3.5 27B has not been scored yet and Seed 2.1 Turbo has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Aion-3.0-Mini, Qwen3.5 27B and Seed 2.1 Turbo yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
Qwen3.5 27B has the largest context window at 262,144 tokens, against 256,000 for Seed 2.1 Turbo and 131,072 for Aion-3.0-Mini. Maximum output per response: Aion-3.0-Mini up to 32,768, Qwen3.5 27B up to 65,536, Seed 2.1 Turbo up to 256,000 tokens.
Which can read images, PDFs, audio or video?
Aion-3.0-Mini accepts text; Qwen3.5 27B accepts text, images and video; Seed 2.1 Turbo accepts text, images and video. Qwen3.5 27B handles the widest range of inputs.
Are any of these open source?
Qwen3.5 27B publishes its weights and can be self-hosted; Aion-3.0-Mini and Seed 2.1 Turbo is proprietary.
Which is newer?
Seed 2.1 Turbo is the newest, released Jun 23, 2026. Aion-3.0-Mini came out May 14, 2026; Qwen3.5 27B 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 Nov 2, 2026.
