Gemini 3.1 Flash Lite vs MiMo-V2-Omni vs Step 3.5 Flash 2603
MiMo-V2-Omni comes out ahead, 77 to 73 and 62 on our weighted score, though Step 3.5 Flash 2603 is 14% cheaper per token.
GoogleGemini 3.1 Flash Lite
73/100- ECI—
- Price$0.25 / $1.50
- Context1.05M
- Our pick
XiaomiMiMo-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 Gemini 3.1 Flash Lite (73) and Step 3.5 Flash 2603 (62). Gemini 3.1 Flash Lite wins on inputs & features and 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 · Gemini 3.1 Flash Lite $0.563 per 1M tokens (3:1 blend)
- Longest contextGemini 3.1 Flash LiteGemini 3.1 Flash Lite 1,048,576 · MiMo-V2-Omni 262,144 · Step 3.5 Flash 2603 256,000 tokens
- Widest inputsGemini 3.1 Flash Lite and MiMo-V2-OmniGemini 3.1 Flash Lite: Text, Images, PDFs, Audio, Video · MiMo-V2-Omni: Text, Images, PDFs, Audio, Video · Step 3.5 Flash 2603: Text
- Self-hostingStep 3.5 Flash 2603Publishes downloadable weights
| Measure | Weight | Gemini 3.1 Flash Lite | MiMo-V2-Omni | Step 3.5 Flash 2603 |
|---|---|---|---|---|
| Price | 50% | 62 | 86 | 89 |
| Inputs & features | 30% | 100 | 90 | 35 |
| Context window | 20% | 61 | 37 | 36 |
| Overall | 100% | 73/100 | 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 | Gemini 3.1 Flash LiteGoogle | MiMo-V2-OmniXiaomi | Step 3.5 Flash 2603StepFun |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.25 | $0.14 | $0.10 (best) |
| Output | $1.50 | $0.28 (best) | $0.30 |
| Cached input | $0.025 | $0.0028 (best) | $0.02 |
| Blended (3:1) | $0.563 | $0.175 | $0.15 (best) |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Google API | Official Xiaomi API | Official StepFun (Global) API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 262,144 tokens | 256,000 tokens |
| Max output | 65,536 tokens | 131,072 tokens | 256,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | No |
| PDFs | Yes | Yes | No |
| Audio | Yes | Yes | No |
| Video | Yes | Yes | No |
| Reasoning | Yesminimal · low · medium · high | Yes | Yeslow · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Open |
| API model ID | gemini-3.1-flash-lite | mimo-v2-omni | step-3.5-flash-2603 |
| API providers | 23 (best) | 2 | 3 |
| Released | May 7, 2026 | Mar 18, 2026 | Apr 2, 2026 |
| Knowledge cutoff | Jan 2025 | 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.
- Gemini 3.1 Flash Lite$5.50
- MiMo-V2-Omni$1.96
- Step 3.5 Flash 2603$1.60
Which should you choose?
Which is better: Gemini 3.1 Flash Lite, MiMo-V2-Omni or Step 3.5 Flash 2603?
MiMo-V2-Omni is the better all-round choice, scoring 77/100 against Gemini 3.1 Flash Lite (73) and Step 3.5 Flash 2603 (62). Gemini 3.1 Flash Lite wins on inputs & features and 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, Gemini 3.1 Flash Lite, 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); Gemini 3.1 Flash Lite costs $0.25 input / $1.50 output per million tokens (official Google 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 $0.563 for Gemini 3.1 Flash Lite (3.8× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Gemini 3.1 Flash Lite 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 Gemini 3.1 Flash Lite, 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?
Gemini 3.1 Flash Lite 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: Gemini 3.1 Flash Lite up to 65,536, 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?
Gemini 3.1 Flash Lite accepts text, images, PDFs, audio and video; MiMo-V2-Omni accepts text, images, PDFs, audio and video; Step 3.5 Flash 2603 accepts text. Gemini 3.1 Flash Lite handles the widest range of inputs.
Are any of these open source?
Step 3.5 Flash 2603 publishes its weights and can be self-hosted; Gemini 3.1 Flash Lite and MiMo-V2-Omni is proprietary.
Which is newer?
Gemini 3.1 Flash Lite is the newest, released May 7, 2026. Step 3.5 Flash 2603 came out Apr 2, 2026; MiMo-V2-Omni came out Mar 18, 2026. Knowledge cutoff: Gemini 3.1 Flash Lite Jan 2025, 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.
