Qwen3.8 Flash vs Seed Character
Too close to call on our weighted score (Qwen3.8 Flash 76, Seed Character 75). The right pick depends on what you value most.
Alibaba (Qwen)Qwen3.8 Flash
76/100- ECI—
- Price$0.15 / $0.47
- Context1M
ByteDance SeedSeed Character
75/100- ECI—
- Price$0.119 / $0.297
- Context256K
Add a model
Make it a three-way comparison.
Too close to call
It is close. Our weighted score puts them within 1 points (Qwen3.8 Flash 76/100, Seed Character 75/100), so choose by what matters most for your work: Seed Character on price and Qwen3.8 Flash 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 CharacterSeed Character $0.163 · Qwen3.8 Flash $0.23 per 1M tokens (3:1 blend)
- Longest contextQwen3.8 FlashQwen3.8 Flash 1,000,000 · Seed Character 256,000 tokens
- Widest inputsSame inputsQwen3.8 Flash: Text, Images, Video · Seed Character: Text, Images, Video
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Qwen3.8 Flash | Seed Character |
|---|---|---|---|
| Price | 50% | 80 | 87 |
| Inputs & features | 30% | 80 | 80 |
| Context window | 20% | 60 | 36 |
| Overall | 100% | 76/100 | 75/100 |
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 | Qwen3.8 FlashAlibaba (Qwen) | Seed CharacterByteDance Seed |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.15 | $0.119 (best) |
| Output | $0.47 | $0.297 (best) |
| Cached input | $0.016 (best) | $0.024 |
| Blended (3:1) | $0.23 | $0.163 (best) |
| Long-context rate | Same rate | Over 32K: $0.178 / $0.891 |
| Price source | Official Alibaba API | Official Volcengine Ark API |
| Limits | ||
| Context window | 1,000,000 tokens (best) | 256,000 tokens |
| Max output | 131,072 tokens | 256,000 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | Yes | Yes |
| Reasoning | Yeslow · medium · xhigh | Yesminimal · low · high |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | qwen3.8-flash | doubao-seed-character-260628 |
| API providers | 23 (best) | 2 |
| Released | Aug 26, 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.
- Qwen3.8 Flash$2.44
- Seed Character$1.78
Which should you choose?
Which is better: Qwen3.8 Flash or Seed Character?
It is close. Our weighted score puts them within 1 points (Qwen3.8 Flash 76/100, Seed Character 75/100), so choose by what matters most for your work: Seed Character on price and Qwen3.8 Flash 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, Qwen3.8 Flash or Seed Character?
Seed Character is cheaper at $0.119 input / $0.297 output per million tokens (official Volcengine Ark API price). Qwen3.8 Flash costs $0.15 input / $0.47 output per million tokens (official Alibaba API price). At a typical mix of three input tokens to one output token, that is $0.163 per million tokens for Seed Character versus $0.23 for Qwen3.8 Flash (1.4× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Qwen3.8 Flash has not been scored yet and Seed Character has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Qwen3.8 Flash and Seed Character 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?
Qwen3.8 Flash has the largest context window at 1,000,000 tokens, against 256,000 for Seed Character. Maximum output per response: Qwen3.8 Flash up to 131,072, Seed Character up to 256,000 tokens.
Which can read images, PDFs, audio or video?
Qwen3.8 Flash accepts text, images and video; Seed Character accepts text, images and video. They handle the same number of input types.
Are any of these open source?
No. Qwen3.8 Flash and Seed Character are proprietary and only available through APIs and apps.
Which is newer?
Qwen3.8 Flash is the newest, released Aug 26, 2026. Seed Character 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.
