Gemini Robotics-ER 1.6 Preview vs MiMo-V2.5-Pro-UltraSpeed vs Seed 2.1 Pro
Too close to call on our weighted score (Seed 2.1 Pro 50, Gemini Robotics-ER 1.6 Preview 50, MiMo-V2.5-Pro-UltraSpeed 43). The right pick depends on what you value most.
GoogleGemini Robotics-ER 1.6 Preview
50/100- ECI—
- Price$1.00 / $5.00
- Context131K
XiaomiMiMo-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
Too close to call
It is close. Our weighted score puts them within a point (Seed 2.1 Pro 50/100, Gemini Robotics-ER 1.6 Preview 50/100, MiMo-V2.5-Pro-UltraSpeed 43/100), so choose by what matters most for your work: MiMo-V2.5-Pro-UltraSpeed on price and MiMo-V2.5-Pro-UltraSpeed 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 priceMiMo-V2.5-Pro-UltraSpeedMiMo-V2.5-Pro-UltraSpeed $1.63 · Seed 2.1 Pro $1.78 · Gemini Robotics-ER 1.6 Preview $2.00 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2.5-Pro-UltraSpeedMiMo-V2.5-Pro-UltraSpeed 1,048,576 · Seed 2.1 Pro 256,000 · Gemini Robotics-ER 1.6 Preview 131,072 tokens
- Widest inputsGemini Robotics-ER 1.6 PreviewGemini Robotics-ER 1.6 Preview: Text, Images, Audio, Video · MiMo-V2.5-Pro-UltraSpeed: Text · Seed 2.1 Pro: Text, Images, Video
- Self-hostingMiMo-V2.5-Pro-UltraSpeedPublishes downloadable weights
| Measure | Weight | Gemini Robotics-ER 1.6 Preview | MiMo-V2.5-Pro-UltraSpeed | Seed 2.1 Pro |
|---|---|---|---|---|
| Price | 50% | 36 | 40 | 38 |
| Inputs & features | 30% | 90 | 35 | 80 |
| Context window | 20% | 24 | 61 | 36 |
| Overall | 100% | 50/100 | 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 | Gemini Robotics-ER 1.6 PreviewGoogle | MiMo-V2.5-Pro-UltraSpeedXiaomi | Seed 2.1 ProByteDance Seed |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $1.00 | $1.30 | $0.891 (best) |
| Output | $5.00 | $2.61 (best) | $4.45 |
| Cached input | — | $0.011 (best) | $0.178 |
| Blended (3:1) | $2.00 | $1.63 (best) | $1.78 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 1 providers | Official Xiaomi API | Official Volcengine Ark API |
| Limits | |||
| Context window | 131,072 tokens | 1,048,576 tokens (best) | 256,000 tokens |
| Max output | 65,536 tokens | 131,072 tokens | 256,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | No | Yes |
| PDFs | No | No | No |
| Audio | Yes | No | No |
| Video | Yes | No | Yes |
| Reasoning | Yes | Yes | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | Yes |
| Availability | |||
| Weights | Proprietary | Open | Proprietary |
| API model ID | — | mimo-v2.5-pro-ultraspeed | doubao-seed-2-1-pro-260628 |
| API providers | 1 | 1 | 2 (best) |
| Released | Apr 14, 2026 | Jun 8, 2026 | Jun 23, 2026 |
| Knowledge cutoff | Jan 2025 | 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.
- Gemini Robotics-ER 1.6 Preview$20.00
- MiMo-V2.5-Pro-UltraSpeed$18.27
- Seed 2.1 Pro$17.81
Which should you choose?
Which is better: Gemini Robotics-ER 1.6 Preview, MiMo-V2.5-Pro-UltraSpeed or Seed 2.1 Pro?
It is close. Our weighted score puts them within a point (Seed 2.1 Pro 50/100, Gemini Robotics-ER 1.6 Preview 50/100, MiMo-V2.5-Pro-UltraSpeed 43/100), so choose by what matters most for your work: MiMo-V2.5-Pro-UltraSpeed on price and MiMo-V2.5-Pro-UltraSpeed 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, Gemini Robotics-ER 1.6 Preview, MiMo-V2.5-Pro-UltraSpeed or Seed 2.1 Pro?
MiMo-V2.5-Pro-UltraSpeed is cheaper at $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); Gemini Robotics-ER 1.6 Preview costs $1.00 input / $5.00 output per million tokens (median across 1 API provider). At a typical mix of three input tokens to one output token, that is $1.63 per million tokens for MiMo-V2.5-Pro-UltraSpeed versus $1.78 for Seed 2.1 Pro (1.1× as much) and $2.00 for Gemini Robotics-ER 1.6 Preview (1.2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Gemini Robotics-ER 1.6 Preview 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 Gemini Robotics-ER 1.6 Preview, 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-UltraSpeed has the largest context window at 1,048,576 tokens, against 256,000 for Seed 2.1 Pro and 131,072 for Gemini Robotics-ER 1.6 Preview. Maximum output per response: Gemini Robotics-ER 1.6 Preview up to 65,536, 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?
Gemini Robotics-ER 1.6 Preview accepts text, images, audio and video; MiMo-V2.5-Pro-UltraSpeed accepts text; Seed 2.1 Pro accepts text, images and video. Gemini Robotics-ER 1.6 Preview 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; Gemini Robotics-ER 1.6 Preview and 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; Gemini Robotics-ER 1.6 Preview came out Apr 14, 2026. Knowledge cutoff: Gemini Robotics-ER 1.6 Preview Jan 2025, 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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