Gemini 3.1 Flash Lite vs Solar Pro 4 vs MiMo-V2.5-Pro
Gemini 3.1 Flash Lite comes out ahead, 73 to 55 and 54 on our weighted score, though Solar Pro 4 is 7% cheaper per token.
- Our pick
GoogleGemini 3.1 Flash Lite
73/100- ECI—
- Price$0.25 / $1.50
- Context1.05M
Upstage
Solar Pro 4
55/100- ECI—
- Price$0.30 / $1.20
- Context524K
XiaomiMiMo-V2.5-Pro
54/100- ECI—
- Price$0.435 / $0.87
- Context1.05M
Gemini 3.1 Flash Lite is our pick
Gemini 3.1 Flash Lite is the better all-round choice, scoring 73/100 against Solar Pro 4 (55) and MiMo-V2.5-Pro (54). It leads 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 priceSolar Pro 4Solar Pro 4 $0.525 · MiMo-V2.5-Pro $0.544 · Gemini 3.1 Flash Lite $0.563 per 1M tokens (3:1 blend)
- Longest contextGemini 3.1 Flash Lite and MiMo-V2.5-ProGemini 3.1 Flash Lite 1,048,576 · MiMo-V2.5-Pro 1,048,576 · Solar Pro 4 524,288 tokens
- Widest inputsGemini 3.1 Flash LiteGemini 3.1 Flash Lite: Text, Images, PDFs, Audio, Video · Solar Pro 4: Text · MiMo-V2.5-Pro: Text
- Self-hostingMiMo-V2.5-ProPublishes downloadable weights
| Measure | Weight | Gemini 3.1 Flash Lite | Solar Pro 4 | MiMo-V2.5-Pro |
|---|---|---|---|---|
| Price | 50% | 62 | 63 | 62 |
| Inputs & features | 30% | 100 | 45 | 35 |
| Context window | 20% | 61 | 49 | 61 |
| Overall | 100% | 73/100 | 55/100 | 54/100 |
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 | Solar Pro 4Upstage | MiMo-V2.5-ProXiaomi |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.25 (best) | $0.30 | $0.435 |
| Output | $1.50 | $1.20 | $0.87 (best) |
| Cached input | $0.025 | $0.06 | $0.0036 (best) |
| Blended (3:1) | $0.563 | $0.525 (best) | $0.544 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Google API | Official Upstage API | Official Xiaomi API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 524,288 tokens | 1,048,576 tokens (best) |
| Max output | 65,536 tokens | 131,072 tokens (best) | 131,072 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | No | No |
| PDFs | Yes | No | No |
| Audio | Yes | No | No |
| Video | Yes | No | No |
| Reasoning | Yesminimal · low · medium · high | Yesminimal · low · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Open |
| API model ID | gemini-3.1-flash-lite | solar-pro4 | mimo-v2.5-pro |
| API providers | 23 (best) | 3 | 20 |
| Released | May 7, 2026 | Aug 6, 2026 | Apr 22, 2026 |
| Knowledge cutoff | Jan 2025 | Feb 2026 | 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 3.1 Flash Lite$5.50
- Solar Pro 4$5.40
- MiMo-V2.5-Pro$6.09
Which should you choose?
Which is better: Gemini 3.1 Flash Lite, Solar Pro 4 or MiMo-V2.5-Pro?
Gemini 3.1 Flash Lite is the better all-round choice, scoring 73/100 against Solar Pro 4 (55) and MiMo-V2.5-Pro (54). It leads 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, Gemini 3.1 Flash Lite, Solar Pro 4 or MiMo-V2.5-Pro?
Solar Pro 4 is cheaper at $0.30 input / $1.20 output per million tokens (official Upstage API price). MiMo-V2.5-Pro costs $0.435 input / $0.87 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 $0.525 per million tokens for Solar Pro 4 versus $0.544 for MiMo-V2.5-Pro (1× as much) and $0.563 for Gemini 3.1 Flash Lite (1.1× 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, Solar Pro 4 has not been scored yet and MiMo-V2.5-Pro has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 3.1 Flash Lite, Solar Pro 4 and MiMo-V2.5-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?
Gemini 3.1 Flash Lite and MiMo-V2.5-Pro have the largest context windows (1,048,576 and 1,048,576 tokens), against 524,288 for Solar Pro 4. Maximum output per response: Gemini 3.1 Flash Lite up to 65,536, Solar Pro 4 up to 131,072, MiMo-V2.5-Pro up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Gemini 3.1 Flash Lite accepts text, images, PDFs, audio and video; Solar Pro 4 accepts text; MiMo-V2.5-Pro accepts text. Gemini 3.1 Flash Lite handles the widest range of inputs.
Are any of these open source?
MiMo-V2.5-Pro publishes its weights and can be self-hosted; Gemini 3.1 Flash Lite and Solar Pro 4 is proprietary.
Which is newer?
Solar Pro 4 is the newest, released Aug 6, 2026. Gemini 3.1 Flash Lite came out May 7, 2026; MiMo-V2.5-Pro came out Apr 22, 2026. Knowledge cutoff: Gemini 3.1 Flash Lite Jan 2025, Solar Pro 4 Feb 2026, MiMo-V2.5-Pro 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.
