Solar Pro 2 vs Phi-4-mini
Phi-4-mini comes out ahead, 56 to 51 on our weighted score, and it is the cheaper option too.
UpstageSolar Pro 2
51/100- ECI—
- Price$0.25 / $0.25
- Context66K
- Our pick
MicrosoftPhi-4-mini
56/100- ECI—
- Price$0.075 / $0.30
- Context128K
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Make it a three-way comparison.
Phi-4-mini is our pick
Phi-4-mini is the better all-round choice, scoring 56/100 against Solar Pro 2 (51). It leads on price and context window. Solar Pro 2 wins 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 pricePhi-4-miniPhi-4-mini $0.131 · Solar Pro 2 $0.25 per 1M tokens (3:1 blend)
- Longest contextPhi-4-miniPhi-4-mini 128,000 · Solar Pro 2 65,536 tokens
- Widest inputsSame inputsSolar Pro 2: Text · Phi-4-mini: Text
- Self-hostingPhi-4-miniPublishes downloadable weights
| Measure | Weight | Solar Pro 2 | Phi-4-mini |
|---|---|---|---|
| Price | 50% | 75 | 88 |
| Inputs & features | 30% | 35 | 25 |
| Context window | 20% | 12 | 24 |
| Overall | 100% | 51/100 | 56/100 |
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 | Solar Pro 2Upstage | Phi-4-miniMicrosoft |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.25 | $0.075 (best) |
| Output | $0.25 (best) | $0.30 |
| Cached input | — | — |
| Blended (3:1) | $0.25 | $0.131 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official Upstage API | Official Azure API |
| Limits | ||
| Context window | 65,536 tokens | 128,000 tokens (best) |
| Max output | 8,192 tokens (best) | 4,096 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | No |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yesminimal · high | No |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | solar-pro2 | phi-4-mini |
| API providers | 2 | 2 |
| Released | May 20, 2025 | Feb 26, 2025 |
| Knowledge cutoff | Mar 2025 | Jun 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Solar Pro 2$3.00
- Phi-4-mini$1.35
Which should you choose?
Which is better: Solar Pro 2 or Phi-4-mini?
Phi-4-mini is the better all-round choice, scoring 56/100 against Solar Pro 2 (51). It leads on price and context window. Solar Pro 2 wins 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, Solar Pro 2 or Phi-4-mini?
Phi-4-mini is cheaper at $0.075 input / $0.30 output per million tokens (official Azure API price). Solar Pro 2 costs $0.25 input / $0.25 output per million tokens (official Upstage API price). At a typical mix of three input tokens to one output token, that is $0.131 per million tokens for Phi-4-mini versus $0.25 for Solar Pro 2 (1.9× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Solar Pro 2 has not been scored yet and Phi-4-mini has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Solar Pro 2 and Phi-4-mini 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?
Phi-4-mini has the largest context window at 128,000 tokens, against 65,536 for Solar Pro 2. Maximum output per response: Solar Pro 2 up to 8,192, Phi-4-mini up to 4,096 tokens.
Which can read images, PDFs, audio or video?
Solar Pro 2 accepts text; Phi-4-mini accepts text. They handle the same number of input types.
Are any of these open source?
Phi-4-mini publishes its weights and can be self-hosted; Solar Pro 2 is proprietary.
Which is newer?
Solar Pro 2 is the newest, released May 20, 2025. Phi-4-mini came out Feb 26, 2025. Knowledge cutoff: Solar Pro 2 Mar 2025, Phi-4-mini Jun 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 Nov 2, 2026.
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