MiMo-V2.5-Pro-UltraSpeed vs Seed Character
Seed Character comes out ahead, 75 to 43 on our weighted score, and it is the cheaper option too.
XiaomiMiMo-V2.5-Pro-UltraSpeed
43/100- ECI—
- Price$1.30 / $2.61
- Context1.05M
- Our pick
ByteDance SeedSeed Character
75/100- ECI—
- Price$0.119 / $0.297
- Context256K
Add a model
Make it a three-way comparison.
Seed Character is our pick
Seed Character is the better all-round choice, scoring 75/100 against MiMo-V2.5-Pro-UltraSpeed (43). It leads on price and inputs & features. MiMo-V2.5-Pro-UltraSpeed wins on context window. 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 · MiMo-V2.5-Pro-UltraSpeed $1.63 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2.5-Pro-UltraSpeedMiMo-V2.5-Pro-UltraSpeed 1,048,576 · Seed Character 256,000 tokens
- Widest inputsSeed CharacterMiMo-V2.5-Pro-UltraSpeed: Text · Seed Character: Text, Images, Video
- Self-hostingMiMo-V2.5-Pro-UltraSpeedPublishes downloadable weights
| Measure | Weight | MiMo-V2.5-Pro-UltraSpeed | Seed Character |
|---|---|---|---|
| Price | 50% | 40 | 87 |
| Inputs & features | 30% | 35 | 80 |
| Context window | 20% | 61 | 36 |
| Overall | 100% | 43/100 | 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 | MiMo-V2.5-Pro-UltraSpeedXiaomi | Seed CharacterByteDance Seed |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $1.30 | $0.119 (best) |
| Output | $2.61 | $0.297 (best) |
| Cached input | $0.011 (best) | $0.024 |
| Blended (3:1) | $1.63 | $0.163 (best) |
| Long-context rate | Same rate | Over 32K: $0.178 / $0.891 |
| Price source | Official Xiaomi API | Official Volcengine Ark API |
| Limits | ||
| Context window | 1,048,576 tokens (best) | 256,000 tokens |
| Max output | 131,072 tokens | 256,000 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | Yes |
| Reasoning | Yes | Yesminimal · low · high |
| Tool calling | Yes | Yes |
| Structured output | No | Yes |
| Availability | ||
| Weights | Open | Proprietary |
| API model ID | mimo-v2.5-pro-ultraspeed | doubao-seed-character-260628 |
| API providers | 1 | 2 (best) |
| Released | Jun 8, 2026 | Jun 23, 2026 |
| Knowledge cutoff | Dec 2024 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- MiMo-V2.5-Pro-UltraSpeed$18.27
- Seed Character$1.78
Which should you choose?
Which is better: MiMo-V2.5-Pro-UltraSpeed or Seed Character?
Seed Character is the better all-round choice, scoring 75/100 against MiMo-V2.5-Pro-UltraSpeed (43). It leads on price and inputs & features. MiMo-V2.5-Pro-UltraSpeed wins on context window. 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, MiMo-V2.5-Pro-UltraSpeed or Seed Character?
Seed Character is cheaper at $0.119 input / $0.297 output per million tokens (official Volcengine Ark API price). MiMo-V2.5-Pro-UltraSpeed costs $1.30 input / $2.61 output per million tokens (official Xiaomi 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 $1.63 for MiMo-V2.5-Pro-UltraSpeed (10× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. MiMo-V2.5-Pro-UltraSpeed 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 MiMo-V2.5-Pro-UltraSpeed 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?
MiMo-V2.5-Pro-UltraSpeed has the largest context window at 1,048,576 tokens, against 256,000 for Seed Character. Maximum output per response: MiMo-V2.5-Pro-UltraSpeed up to 131,072, Seed Character up to 256,000 tokens.
Which can read images, PDFs, audio or video?
MiMo-V2.5-Pro-UltraSpeed accepts text; Seed Character accepts text, images and video. Seed Character handles the widest range of inputs.
Are any of these open source?
MiMo-V2.5-Pro-UltraSpeed publishes its weights and can be self-hosted; Seed Character is proprietary.
Which is newer?
Seed Character is the newest, released Jun 23, 2026. MiMo-V2.5-Pro-UltraSpeed came out Jun 8, 2026. Knowledge cutoff: MiMo-V2.5-Pro-UltraSpeed Dec 2024.
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.
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