MiMo-V2.5-Pro vs MiMo-V2.5-Pro-UltraSpeed vs Seed 2.1 Pro
MiMo-V2.5-Pro comes out ahead, 54 to 50 and 43 on our weighted score, and it is the cheaper option too.
- Our pick
XiaomiMiMo-V2.5-Pro
54/100- ECI—
- Price$0.435 / $0.87
- Context1.05M
- Xiaomi
MiMo-V2.5-Pro-UltraSpeed
43/100- ECI—
- Price$1.30 / $2.61
- Context1.05M
ByteDance SeedSeed 2.1 Pro
50/100- ECI—
- Price$0.891 / $4.45
- Context256K
MiMo-V2.5-Pro is our pick
MiMo-V2.5-Pro is the better all-round choice, scoring 54/100 against Seed 2.1 Pro (50) and MiMo-V2.5-Pro-UltraSpeed (43). It leads on price. Seed 2.1 Pro wins on inputs & features. 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 priceMiMo-V2.5-ProMiMo-V2.5-Pro $0.544 · MiMo-V2.5-Pro-UltraSpeed $1.63 · Seed 2.1 Pro $1.78 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2.5-Pro and MiMo-V2.5-Pro-UltraSpeedMiMo-V2.5-Pro 1,048,576 · MiMo-V2.5-Pro-UltraSpeed 1,048,576 · Seed 2.1 Pro 256,000 tokens
- Widest inputsSeed 2.1 ProMiMo-V2.5-Pro: Text · MiMo-V2.5-Pro-UltraSpeed: Text · Seed 2.1 Pro: Text, Images, Video
- Self-hostingMiMo-V2.5-Pro and MiMo-V2.5-Pro-UltraSpeedPublishes downloadable weights
| Measure | Weight | MiMo-V2.5-Pro | MiMo-V2.5-Pro-UltraSpeed | Seed 2.1 Pro |
|---|---|---|---|---|
| Price | 50% | 62 | 40 | 38 |
| Inputs & features | 30% | 35 | 35 | 80 |
| Context window | 20% | 61 | 61 | 36 |
| Overall | 100% | 54/100 | 43/100 | 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 | MiMo-V2.5-ProXiaomi | MiMo-V2.5-Pro-UltraSpeedXiaomi | Seed 2.1 ProByteDance Seed |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.435 (best) | $1.30 | $0.891 |
| Output | $0.87 (best) | $2.61 | $4.45 |
| Cached input | $0.0036 (best) | $0.011 | $0.178 |
| Blended (3:1) | $0.544 (best) | $1.63 | $1.78 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Xiaomi API | Official Xiaomi API | Official Volcengine Ark API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 1,048,576 tokens (best) | 256,000 tokens |
| Max output | 131,072 tokens | 131,072 tokens | 256,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | No | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | Yes |
| Reasoning | Yes | Yes | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | Open | Open | Proprietary |
| API model ID | mimo-v2.5-pro | mimo-v2.5-pro-ultraspeed | doubao-seed-2-1-pro-260628 |
| API providers | 20 (best) | 1 | 2 |
| Released | Apr 22, 2026 | Jun 8, 2026 | Jun 23, 2026 |
| Knowledge cutoff | Dec 2024 | 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$6.09
- MiMo-V2.5-Pro-UltraSpeed$18.27
- Seed 2.1 Pro$17.81
Which should you choose?
Which is better: MiMo-V2.5-Pro, MiMo-V2.5-Pro-UltraSpeed or Seed 2.1 Pro?
MiMo-V2.5-Pro is the better all-round choice, scoring 54/100 against Seed 2.1 Pro (50) and MiMo-V2.5-Pro-UltraSpeed (43). It leads on price. Seed 2.1 Pro wins on inputs & features. 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, MiMo-V2.5-Pro-UltraSpeed or Seed 2.1 Pro?
MiMo-V2.5-Pro is cheaper at $0.435 input / $0.87 output per million tokens (official Xiaomi API price). MiMo-V2.5-Pro-UltraSpeed costs $1.30 input / $2.61 output per million tokens (official Xiaomi API price); Seed 2.1 Pro 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 $0.544 per million tokens for MiMo-V2.5-Pro versus $1.63 for MiMo-V2.5-Pro-UltraSpeed (3× as much) and $1.78 for Seed 2.1 Pro (3.3× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. MiMo-V2.5-Pro has not been scored yet, MiMo-V2.5-Pro-UltraSpeed has not been scored yet and Seed 2.1 Pro has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for MiMo-V2.5-Pro, MiMo-V2.5-Pro-UltraSpeed and Seed 2.1 Pro 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?
MiMo-V2.5-Pro and MiMo-V2.5-Pro-UltraSpeed have the largest context windows (1,048,576 and 1,048,576 tokens), against 256,000 for Seed 2.1 Pro. Maximum output per response: MiMo-V2.5-Pro up to 131,072, MiMo-V2.5-Pro-UltraSpeed up to 131,072, Seed 2.1 Pro up to 256,000 tokens.
Which can read images, PDFs, audio or video?
MiMo-V2.5-Pro accepts text; MiMo-V2.5-Pro-UltraSpeed accepts text; Seed 2.1 Pro accepts text, images and video. Seed 2.1 Pro handles the widest range of inputs.
Are any of these open source?
MiMo-V2.5-Pro and MiMo-V2.5-Pro-UltraSpeed publishes its weights and can be self-hosted; Seed 2.1 Pro is proprietary.
Which is newer?
Seed 2.1 Pro is the newest, released Jun 23, 2026. MiMo-V2.5-Pro-UltraSpeed came out Jun 8, 2026; MiMo-V2.5-Pro came out Apr 22, 2026. Knowledge cutoff: MiMo-V2.5-Pro Dec 2024, 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.
