Kimi K3.1 Pro vs Solar Mini 4
Solar Mini 4 comes out ahead, 64 to 46 on our weighted score, and it is the cheaper option too.
Moonshot AIKimi K3.1 Pro
46/100- ECI—
- Price$2.00 / $10.00
- Context1.05M
- Our pick
UpstageSolar Mini 4
64/100- ECI—
- Price$0.10 / $0.40
- Context524K
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Make it a three-way comparison.
Solar Mini 4 is our pick
Solar Mini 4 is the better all-round choice, scoring 64/100 against Kimi K3.1 Pro (46). It leads on price. Kimi K3.1 Pro wins on inputs & features and context window. 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 Mini 4Solar Mini 4 $0.175 · Kimi K3.1 Pro $4.00 per 1M tokens (3:1 blend)
- Longest contextKimi K3.1 ProKimi K3.1 Pro 1,048,576 · Solar Mini 4 524,288 tokens
- Widest inputsKimi K3.1 ProKimi K3.1 Pro: Text, Images, Video · Solar Mini 4: Text
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Kimi K3.1 Pro | Solar Mini 4 |
|---|---|---|---|
| Price | 50% | 20 | 82 |
| Inputs & features | 30% | 80 | 45 |
| Context window | 20% | 61 | 49 |
| Overall | 100% | 46/100 | 64/100 |
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 | Kimi K3.1 ProMoonshot AI | Solar Mini 4Upstage |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $2.00 | $0.10 (best) |
| Output | $10.00 | $0.40 (best) |
| Cached input | $0.20 | $0.01 (best) |
| Blended (3:1) | $4.00 | $0.175 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official Moonshot AI API | Official Upstage API |
| Limits | ||
| Context window | 1,048,576 tokens (best) | 524,288 tokens |
| Max output | 131,072 tokens | 131,072 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | No |
| PDFs | No | No |
| Audio | No | No |
| Video | Yes | No |
| Reasoning | Yeslow · high · max | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | kimi-k3.1-pro | solar-mini4 |
| API providers | 17 (best) | 4 |
| Released | Oct 23, 2026 | Sep 22, 2026 |
| Knowledge cutoff | — | Feb 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Kimi K3.1 Pro$40.00
- Solar Mini 4$1.80
Which should you choose?
Which is better: Kimi K3.1 Pro or Solar Mini 4?
Solar Mini 4 is the better all-round choice, scoring 64/100 against Kimi K3.1 Pro (46). It leads on price. Kimi K3.1 Pro wins on inputs & features and context window. 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, Kimi K3.1 Pro or Solar Mini 4?
Solar Mini 4 is cheaper at $0.10 input / $0.40 output per million tokens (official Upstage API price). Kimi K3.1 Pro costs $2.00 input / $10.00 output per million tokens (official Moonshot AI API price). At a typical mix of three input tokens to one output token, that is $0.175 per million tokens for Solar Mini 4 versus $4.00 for Kimi K3.1 Pro (23× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Kimi K3.1 Pro has not been scored yet and Solar Mini 4 has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Kimi K3.1 Pro and Solar Mini 4 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
Kimi K3.1 Pro has the largest context window at 1,048,576 tokens, against 524,288 for Solar Mini 4. Maximum output per response: Kimi K3.1 Pro up to 131,072, Solar Mini 4 up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Kimi K3.1 Pro accepts text, images and video; Solar Mini 4 accepts text. Kimi K3.1 Pro handles the widest range of inputs.
Are any of these open source?
No. Kimi K3.1 Pro and Solar Mini 4 are proprietary and only available through APIs and apps.
Which is newer?
Kimi K3.1 Pro is the newest, released Oct 23, 2026. Solar Mini 4 came out Sep 22, 2026. Knowledge cutoff: Solar Mini 4 Feb 2026.
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 Nov 2, 2026.
