Solar Pro 2 vs Aion-RP 1.0 (8B)
Solar Pro 2 comes out ahead, 51 to 24 on our weighted score, and it is the cheaper option too.
- Our pick
UpstageSolar Pro 2
51/100- ECI—
- Price$0.25 / $0.25
- Context66K
Aion Labs
Aion-RP 1.0 (8B)
24/100- ECI—
- Price$0.80 / $1.60
- Context33K
Add a model
Make it a three-way comparison.
Solar Pro 2 is our pick
Solar Pro 2 is the better all-round choice, scoring 51/100 against Aion-RP 1.0 (8B) (24). It leads on price, 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 Pro 2Solar Pro 2 $0.25 · Aion-RP 1.0 (8B) $1.00 per 1M tokens (3:1 blend)
- Longest contextSolar Pro 2Solar Pro 2 65,536 · Aion-RP 1.0 (8B) 32,768 tokens
- Widest inputsSame inputsSolar Pro 2: Text · Aion-RP 1.0 (8B): Text
- Self-hostingAion-RP 1.0 (8B)Publishes downloadable weights
| Measure | Weight | Solar Pro 2 | Aion-RP 1.0 (8B) |
|---|---|---|---|
| Price | 50% | 75 | 48 |
| Inputs & features | 30% | 35 | 0 |
| Context window | 20% | 12 | 0 |
| Overall | 100% | 51/100 | 24/100 |
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 | Aion-RP 1.0 (8B)Aion Labs |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.25 (best) | $0.80 |
| Output | $0.25 (best) | $1.60 |
| Cached input | — | — |
| Blended (3:1) | $0.25 (best) | $1.00 |
| Long-context rate | Same rate | Same rate |
| Price source | Official Upstage API | Median of 4 providers |
| Limits | ||
| Context window | 65,536 tokens (best) | 32,768 tokens |
| Max output | 8,192 tokens | 29,491 tokens (best) |
| 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 | No |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | solar-pro2 | — |
| API providers | 2 | 4 (best) |
| Released | May 20, 2025 | Feb 4, 2025 |
| Knowledge cutoff | Mar 2025 | Dec 31, 2023 |
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
- Aion-RP 1.0 (8B)$11.20
Which should you choose?
Which is better: Solar Pro 2 or Aion-RP 1.0 (8B)?
Solar Pro 2 is the better all-round choice, scoring 51/100 against Aion-RP 1.0 (8B) (24). It leads on price, 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, Solar Pro 2 or Aion-RP 1.0 (8B)?
Solar Pro 2 is cheaper at $0.25 input / $0.25 output per million tokens (official Upstage API price). Aion-RP 1.0 (8B) costs $0.80 input / $1.60 output per million tokens (median across 4 API providers). At a typical mix of three input tokens to one output token, that is $0.25 per million tokens for Solar Pro 2 versus $1.00 for Aion-RP 1.0 (8B) (4× 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 Aion-RP 1.0 (8B) has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Solar Pro 2 and Aion-RP 1.0 (8B) yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Note that Aion-RP 1.0 (8B) does not support tool calling, which most coding agents need.
Which has the bigger context window?
Solar Pro 2 has the largest context window at 65,536 tokens, against 32,768 for Aion-RP 1.0 (8B). Maximum output per response: Solar Pro 2 up to 8,192, Aion-RP 1.0 (8B) up to 29,491 tokens.
Which can read images, PDFs, audio or video?
Solar Pro 2 accepts text; Aion-RP 1.0 (8B) accepts text. They handle the same number of input types.
Are any of these open source?
Aion-RP 1.0 (8B) 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. Aion-RP 1.0 (8B) came out Feb 4, 2025. Knowledge cutoff: Solar Pro 2 Mar 2025, Aion-RP 1.0 (8B) Dec 31, 2023.
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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