Solar Pro 2 vs Gemini 2.5 Pro Preview 06-05 vs Gemini 2.5 Flash-Lite
Gemini 2.5 Flash-Lite comes out ahead, 83 to 51 and 48 on our weighted score, and it is the cheaper option too.
UpstageSolar Pro 2
51/100- ECI—
- Price$0.25 / $0.25
- Context66K
GoogleGemini 2.5 Pro Preview 06-05
48/100- ECI—
- Price$1.22 / $9.75
- Context1.05M
- Our pickGoogle
Gemini 2.5 Flash-Lite
83/100- ECI—
- Price$0.10 / $0.40
- Context1.05M
Gemini 2.5 Flash-Lite is our pick
Gemini 2.5 Flash-Lite is the better all-round choice, scoring 83/100 against Solar Pro 2 (51) and Gemini 2.5 Pro Preview 06-05 (48). It leads on price and 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 priceGemini 2.5 Flash-LiteGemini 2.5 Flash-Lite $0.175 · Solar Pro 2 $0.25 · Gemini 2.5 Pro Preview 06-05 $3.35 per 1M tokens (3:1 blend)
- Longest contextGemini 2.5 Pro Preview 06-05 and Gemini 2.5 Flash-LiteGemini 2.5 Pro Preview 06-05 1,048,576 · Gemini 2.5 Flash-Lite 1,048,576 · Solar Pro 2 65,536 tokens
- Widest inputsGemini 2.5 Flash-LiteSolar Pro 2: Text · Gemini 2.5 Pro Preview 06-05: Text, Images, PDFs, Audio · Gemini 2.5 Flash-Lite: Text, Images, PDFs, Audio, Video
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Solar Pro 2 | Gemini 2.5 Pro Preview 06-05 | Gemini 2.5 Flash-Lite |
|---|---|---|---|---|
| Price | 50% | 75 | 24 | 82 |
| Inputs & features | 30% | 35 | 80 | 100 |
| Context window | 20% | 12 | 61 | 61 |
| Overall | 100% | 51/100 | 48/100 | 83/100 |
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 | Gemini 2.5 Pro Preview 06-05Google | Gemini 2.5 Flash-LiteGoogle |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.25 | $1.22 | $0.10 (best) |
| Output | $0.25 (best) | $9.75 | $0.40 |
| Cached input | — | — | $0.01 |
| Blended (3:1) | $0.25 | $3.35 | $0.175 (best) |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Upstage API | Median of 4 providers | Official Google API |
| Limits | |||
| Context window | 65,536 tokens | 1,048,576 tokens (best) | 1,048,576 tokens (best) |
| Max output | 8,192 tokens | 65,536 tokens (best) | 65,536 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | Yes | Yes |
| PDFs | No | Yes | Yes |
| Audio | No | Yes | Yes |
| Video | No | No | Yes |
| Reasoning | Yesminimal · high | Yes | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | solar-pro2 | — | gemini-2.5-flash-lite |
| API providers | 2 | 4 | 24 (best) |
| Released | May 20, 2025 | Jun 5, 2025 | Jun 17, 2025 |
| Knowledge cutoff | Mar 2025 | Jan 31, 2025 | 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.
- Solar Pro 2$3.00
- Gemini 2.5 Pro Preview 06-05$31.69
- Gemini 2.5 Flash-Lite$1.80
Which should you choose?
Which is better: Solar Pro 2, Gemini 2.5 Pro Preview 06-05 or Gemini 2.5 Flash-Lite?
Gemini 2.5 Flash-Lite is the better all-round choice, scoring 83/100 against Solar Pro 2 (51) and Gemini 2.5 Pro Preview 06-05 (48). It leads on price and 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, Gemini 2.5 Pro Preview 06-05 or Gemini 2.5 Flash-Lite?
Gemini 2.5 Flash-Lite is cheaper at $0.10 input / $0.40 output per million tokens (official Google API price). Solar Pro 2 costs $0.25 input / $0.25 output per million tokens (official Upstage API price); Gemini 2.5 Pro Preview 06-05 costs $1.22 input / $9.75 output per million tokens (median across 4 API providers). At a typical mix of three input tokens to one output token, that is $0.175 per million tokens for Gemini 2.5 Flash-Lite versus $0.25 for Solar Pro 2 (1.4× as much) and $3.35 for Gemini 2.5 Pro Preview 06-05 (19× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Solar Pro 2 has not been scored yet, Gemini 2.5 Pro Preview 06-05 has not been scored yet and Gemini 2.5 Flash-Lite has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Solar Pro 2, Gemini 2.5 Pro Preview 06-05 and Gemini 2.5 Flash-Lite 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 2.5 Pro Preview 06-05 and Gemini 2.5 Flash-Lite have the largest context windows (1,048,576 and 1,048,576 tokens), against 65,536 for Solar Pro 2. Maximum output per response: Solar Pro 2 up to 8,192, Gemini 2.5 Pro Preview 06-05 up to 65,536, Gemini 2.5 Flash-Lite up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Solar Pro 2 accepts text; Gemini 2.5 Pro Preview 06-05 accepts text, images, PDFs and audio; Gemini 2.5 Flash-Lite accepts text, images, PDFs, audio and video. Gemini 2.5 Flash-Lite handles the widest range of inputs.
Are any of these open source?
No. Solar Pro 2, Gemini 2.5 Pro Preview 06-05 and Gemini 2.5 Flash-Lite are proprietary and only available through APIs and apps.
Which is newer?
Gemini 2.5 Flash-Lite is the newest, released Jun 17, 2025. Gemini 2.5 Pro Preview 06-05 came out Jun 5, 2025; Solar Pro 2 came out May 20, 2025. Knowledge cutoff: Solar Pro 2 Mar 2025, Gemini 2.5 Pro Preview 06-05 Jan 31, 2025, Gemini 2.5 Flash-Lite 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 Nov 2, 2026.
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