Seed 2.1 Pro vs MiMo-V2.5 vs MiMo-V2.5-Pro-UltraSpeed
MiMo-V2.5 comes out ahead, 79 to 50 and 43 on our weighted score, and it is the cheaper option too.
ByteDance SeedSeed 2.1 Pro
50/100- ECI—
- Price$0.891 / $4.45
- Context256K
- Our pick
XiaomiMiMo-V2.5
79/100- ECI—
- Price$0.14 / $0.28
- Context1.05M
- Xiaomi
MiMo-V2.5-Pro-UltraSpeed
43/100- ECI—
- Price$1.30 / $2.61
- Context1.05M
MiMo-V2.5 is our pick
MiMo-V2.5 is the better all-round choice, scoring 79/100 against Seed 2.1 Pro (50) and MiMo-V2.5-Pro-UltraSpeed (43). It leads on price. 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-V2.5MiMo-V2.5 $0.175 · MiMo-V2.5-Pro-UltraSpeed $1.63 · Seed 2.1 Pro $1.78 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2.5 and MiMo-V2.5-Pro-UltraSpeedMiMo-V2.5 1,048,576 · MiMo-V2.5-Pro-UltraSpeed 1,048,576 · Seed 2.1 Pro 256,000 tokens
- Widest inputsMiMo-V2.5Seed 2.1 Pro: Text, Images, Video · MiMo-V2.5: Text, Images, Audio, Video · MiMo-V2.5-Pro-UltraSpeed: Text
- Self-hostingMiMo-V2.5 and MiMo-V2.5-Pro-UltraSpeedPublishes downloadable weights
| Measure | Weight | Seed 2.1 Pro | MiMo-V2.5 | MiMo-V2.5-Pro-UltraSpeed |
|---|---|---|---|---|
| Price | 50% | 38 | 86 | 40 |
| Inputs & features | 30% | 80 | 80 | 35 |
| Context window | 20% | 36 | 61 | 61 |
| Overall | 100% | 50/100 | 79/100 | 43/100 |
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 ProByteDance Seed | MiMo-V2.5Xiaomi | MiMo-V2.5-Pro-UltraSpeedXiaomi |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.891 | $0.14 (best) | $1.30 |
| Output | $4.45 | $0.28 (best) | $2.61 |
| Cached input | $0.178 | $0.0028 (best) | $0.011 |
| Blended (3:1) | $1.78 | $0.175 (best) | $1.63 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Volcengine Ark API | Official Xiaomi API | Official Xiaomi API |
| Limits | |||
| Context window | 256,000 tokens | 1,048,576 tokens (best) | 1,048,576 tokens (best) |
| Max output | 256,000 tokens (best) | 131,072 tokens | 131,072 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | No |
| PDFs | No | No | No |
| Audio | No | Yes | No |
| Video | Yes | Yes | No |
| Reasoning | Yesminimal · low · medium · high · xhigh · max | Yes | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | No |
| Availability | |||
| Weights | Proprietary | Open | Open |
| API model ID | doubao-seed-2-1-pro-260628 | mimo-v2.5 | mimo-v2.5-pro-ultraspeed |
| API providers | 2 | 21 (best) | 1 |
| Released | Jun 23, 2026 | Apr 22, 2026 | Jun 8, 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.
- Seed 2.1 Pro$17.81
- MiMo-V2.5$1.96
- MiMo-V2.5-Pro-UltraSpeed$18.27
Which should you choose?
Which is better: Seed 2.1 Pro, MiMo-V2.5 or MiMo-V2.5-Pro-UltraSpeed?
MiMo-V2.5 is the better all-round choice, scoring 79/100 against Seed 2.1 Pro (50) and MiMo-V2.5-Pro-UltraSpeed (43). It leads on price. 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 Pro, MiMo-V2.5 or MiMo-V2.5-Pro-UltraSpeed?
MiMo-V2.5 is cheaper at $0.14 input / $0.28 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 $0.175 per million tokens for MiMo-V2.5 versus $1.63 for MiMo-V2.5-Pro-UltraSpeed (9.3× as much) and $1.78 for Seed 2.1 Pro (10× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Seed 2.1 Pro has not been scored yet, MiMo-V2.5 has not been scored yet and MiMo-V2.5-Pro-UltraSpeed has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Seed 2.1 Pro, MiMo-V2.5 and MiMo-V2.5-Pro-UltraSpeed 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 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: Seed 2.1 Pro up to 256,000, MiMo-V2.5 up to 131,072, MiMo-V2.5-Pro-UltraSpeed up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Seed 2.1 Pro accepts text, images and video; MiMo-V2.5 accepts text, images, audio and video; MiMo-V2.5-Pro-UltraSpeed accepts text. MiMo-V2.5 handles the widest range of inputs.
Are any of these open source?
MiMo-V2.5 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 came out Apr 22, 2026. Knowledge cutoff: MiMo-V2.5 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.
