MiMo-V2.5-Pro vs MiMo-V2-Omni vs Step 3.5 Flash 2603
MiMo-V2-Omni comes out ahead, 77 to 62 and 54 on our weighted score, though Step 3.5 Flash 2603 is 14% cheaper per token.
XiaomiMiMo-V2.5-Pro
54/100- ECI—
- Price$0.435 / $0.87
- Context1.05M
- Our pickXiaomi
MiMo-V2-Omni
77/100- ECI—
- Price$0.14 / $0.28
- Context262K
StepFunStep 3.5 Flash 2603
62/100- ECI—
- Price$0.10 / $0.30
- Context256K
MiMo-V2-Omni is our pick
MiMo-V2-Omni is the better all-round choice, scoring 77/100 against Step 3.5 Flash 2603 (62) and MiMo-V2.5-Pro (54). It leads on inputs & features. MiMo-V2.5-Pro wins on context window. Step 3.5 Flash 2603 wins 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 priceStep 3.5 Flash 2603Step 3.5 Flash 2603 $0.15 · MiMo-V2-Omni $0.175 · MiMo-V2.5-Pro $0.544 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2.5-ProMiMo-V2.5-Pro 1,048,576 · MiMo-V2-Omni 262,144 · Step 3.5 Flash 2603 256,000 tokens
- Widest inputsMiMo-V2-OmniMiMo-V2.5-Pro: Text · MiMo-V2-Omni: Text, Images, PDFs, Audio, Video · Step 3.5 Flash 2603: Text
- Self-hostingMiMo-V2.5-Pro and Step 3.5 Flash 2603Publishes downloadable weights
| Measure | Weight | MiMo-V2.5-Pro | MiMo-V2-Omni | Step 3.5 Flash 2603 |
|---|---|---|---|---|
| Price | 50% | 62 | 86 | 89 |
| Inputs & features | 30% | 35 | 90 | 35 |
| Context window | 20% | 61 | 37 | 36 |
| Overall | 100% | 54/100 | 77/100 | 62/100 |
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-OmniXiaomi | Step 3.5 Flash 2603StepFun |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.435 | $0.14 | $0.10 (best) |
| Output | $0.87 | $0.28 (best) | $0.30 |
| Cached input | $0.0036 | $0.0028 (best) | $0.02 |
| Blended (3:1) | $0.544 | $0.175 | $0.15 (best) |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Xiaomi API | Official Xiaomi API | Official StepFun (Global) API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 262,144 tokens | 256,000 tokens |
| Max output | 131,072 tokens | 131,072 tokens | 256,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | Yes | No |
| PDFs | No | Yes | No |
| Audio | No | Yes | No |
| Video | No | Yes | No |
| Reasoning | Yes | Yes | Yeslow · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | No |
| Availability | |||
| Weights | Open | Proprietary | Open |
| API model ID | mimo-v2.5-pro | mimo-v2-omni | step-3.5-flash-2603 |
| API providers | 20 (best) | 2 | 3 |
| Released | Apr 22, 2026 | Mar 18, 2026 | Apr 2, 2026 |
| Knowledge cutoff | Dec 2024 | Dec 2024 | Jan 2025 |
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-Omni$1.96
- Step 3.5 Flash 2603$1.60
Which should you choose?
Which is better: MiMo-V2.5-Pro, MiMo-V2-Omni or Step 3.5 Flash 2603?
MiMo-V2-Omni is the better all-round choice, scoring 77/100 against Step 3.5 Flash 2603 (62) and MiMo-V2.5-Pro (54). It leads on inputs & features. MiMo-V2.5-Pro wins on context window. Step 3.5 Flash 2603 wins 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, MiMo-V2.5-Pro, MiMo-V2-Omni or Step 3.5 Flash 2603?
Step 3.5 Flash 2603 is cheaper at $0.10 input / $0.30 output per million tokens (official StepFun (Global) API price). MiMo-V2-Omni costs $0.14 input / $0.28 output per million tokens (official Xiaomi API price); MiMo-V2.5-Pro costs $0.435 input / $0.87 output per million tokens (official Xiaomi API price). At a typical mix of three input tokens to one output token, that is $0.15 per million tokens for Step 3.5 Flash 2603 versus $0.175 for MiMo-V2-Omni (1.2× as much) and $0.544 for MiMo-V2.5-Pro (3.6× 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-Omni has not been scored yet and Step 3.5 Flash 2603 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-Omni and Step 3.5 Flash 2603 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 has the largest context window at 1,048,576 tokens, against 262,144 for MiMo-V2-Omni and 256,000 for Step 3.5 Flash 2603. Maximum output per response: MiMo-V2.5-Pro up to 131,072, MiMo-V2-Omni up to 131,072, Step 3.5 Flash 2603 up to 256,000 tokens.
Which can read images, PDFs, audio or video?
MiMo-V2.5-Pro accepts text; MiMo-V2-Omni accepts text, images, PDFs, audio and video; Step 3.5 Flash 2603 accepts text. MiMo-V2-Omni handles the widest range of inputs.
Are any of these open source?
MiMo-V2.5-Pro and Step 3.5 Flash 2603 publishes its weights and can be self-hosted; MiMo-V2-Omni is proprietary.
Which is newer?
MiMo-V2.5-Pro is the newest, released Apr 22, 2026. Step 3.5 Flash 2603 came out Apr 2, 2026; MiMo-V2-Omni came out Mar 18, 2026. Knowledge cutoff: MiMo-V2.5-Pro Dec 2024, MiMo-V2-Omni Dec 2024, Step 3.5 Flash 2603 Jan 2025.
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.
