Solar Pro 4 vs Qwen3.8 Flash Next
Qwen3.8 Flash Next comes out ahead, 70 to 55 on our weighted score, and it is the cheaper option too.
Upstage
Solar Pro 4
55/100- ECI—
- Price$0.30 / $1.20
- Context524K
- Our pick
Alibaba (Qwen)Qwen3.8 Flash Next
70/100- ECI—
- Price$0.20 / $0.50
- Context262K
Add a model
Make it a three-way comparison.
Qwen3.8 Flash Next is our pick
Qwen3.8 Flash Next is the better all-round choice, scoring 70/100 against Solar Pro 4 (55). It leads on price and inputs & features. Solar Pro 4 wins on 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 priceQwen3.8 Flash NextQwen3.8 Flash Next $0.275 · Solar Pro 4 $0.525 per 1M tokens (3:1 blend)
- Longest contextSolar Pro 4Solar Pro 4 524,288 · Qwen3.8 Flash Next 262,144 tokens
- Widest inputsQwen3.8 Flash NextSolar Pro 4: Text · Qwen3.8 Flash Next: Text, Images, Video
- Self-hostingQwen3.8 Flash NextPublishes downloadable weights (qwen-community-1.0)
| Measure | Weight | Solar Pro 4 | Qwen3.8 Flash Next |
|---|---|---|---|
| Price | 50% | 63 | 76 |
| Inputs & features | 30% | 45 | 80 |
| Context window | 20% | 49 | 37 |
| Overall | 100% | 55/100 | 70/100 |
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 4Upstage | Qwen3.8 Flash NextAlibaba (Qwen) |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.30 | $0.20 (best) |
| Output | $1.20 | $0.50 (best) |
| Cached input | $0.06 | — |
| Blended (3:1) | $0.525 | $0.275 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official Upstage API | Median of 5 providers |
| Limits | ||
| Context window | 524,288 tokens (best) | 262,144 tokens |
| Max output | 131,072 tokens | 131,072 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | Yes |
| Reasoning | Yesminimal · low · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Openqwen-community-1.0 |
| API model ID | solar-pro4 | — |
| API providers | 3 | 5 (best) |
| Released | Aug 6, 2026 | Aug 27, 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.
- Solar Pro 4$5.40
- Qwen3.8 Flash Next$3.00
Which should you choose?
Which is better: Solar Pro 4 or Qwen3.8 Flash Next?
Qwen3.8 Flash Next is the better all-round choice, scoring 70/100 against Solar Pro 4 (55). It leads on price and inputs & features. Solar Pro 4 wins on 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 4 or Qwen3.8 Flash Next?
Qwen3.8 Flash Next is cheaper at $0.20 input / $0.50 output per million tokens (median across 5 API providers). Solar Pro 4 costs $0.30 input / $1.20 output per million tokens (official Upstage API price). At a typical mix of three input tokens to one output token, that is $0.275 per million tokens for Qwen3.8 Flash Next versus $0.525 for Solar Pro 4 (1.9× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Solar Pro 4 has not been scored yet and Qwen3.8 Flash Next has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Solar Pro 4 and Qwen3.8 Flash Next 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?
Solar Pro 4 has the largest context window at 524,288 tokens, against 262,144 for Qwen3.8 Flash Next. Maximum output per response: Solar Pro 4 up to 131,072, Qwen3.8 Flash Next up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Solar Pro 4 accepts text; Qwen3.8 Flash Next accepts text, images and video. Qwen3.8 Flash Next handles the widest range of inputs.
Are any of these open source?
Qwen3.8 Flash Next publishes its weights (qwen-community-1.0) and can be self-hosted; Solar Pro 4 is proprietary.
Which is newer?
Qwen3.8 Flash Next is the newest, released Aug 27, 2026. Solar Pro 4 came out Aug 6, 2026. Knowledge cutoff: Solar Pro 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 Oct 4, 2026.
