Qwen3.8 Flash vs Solar Pro 4: Specs & Benchmark Comparison
Qwen3.8 Flash is developed by Alibaba, while Solar Pro 4 comes from Upstage. Both were released in August 2026. Qwen3.8 Flash has a published size of about 125 billion parameters; Upstage has not disclosed the parameter count of Solar Pro 4.
We have 22 benchmark results for Qwen3.8 Flash and 9 benchmark results for Solar Pro 4, but they overlap on a single test: GPQA, where Qwen3.8 Flash scores 91.7% against 89.0%.
Qwen3.8 Flash is the cheaper API at $0.15 per million input tokens and $0.47 per million output tokens, roughly 2 times cheaper than Solar Pro 4 at $0.30 and $1.20. Qwen3.8 Flash takes the larger context window at 1M tokens, compared with 524K for Solar Pro 4. Qwen3.8 Flash accepts text, images, and video as input, while Solar Pro 4 accepts text.
| Characteristic | Qwen3.8 Flash | Solar Pro 4 |
|---|---|---|
| Company | Alibaba | Upstage |
| Release Date | August 26, 2026 | August 6, 2026 |
| Parameters | 125B | — |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 524K |
| Context (output) | 131K | 131K |
| Input Price / 1M | $0.15 | $0.30 |
| Output Price / 1M | $0.47 | $1.20 |
| Average Score | 68.5% | 69.9% |
| Benchmarks | ||
| GPQA | 91.7% | 89.0% |
Visual Benchmark Comparison
Verdict
Qwen3.8 Flash leads in 3 out of 4 comparison categories.
Both models show comparable average scores: Qwen3.8 Flash — 0.7, Solar Pro 4 — 0.7.
Qwen3.8 Flash is 2.4x cheaper: input $0.15/1M vs $0.30/1M tokens.
Qwen3.8 Flash supports a larger context: 1M vs 524K tokens.
Qwen3.8 Flash is newer: released 8/26/2026 vs 8/6/2026.
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Frequently Asked Questions
Which is better for coding — Qwen3.8 Flash or Solar Pro 4?
Which model is cheaper — Qwen3.8 Flash or Solar Pro 4?
Which has a larger context window — Qwen3.8 Flash or Solar Pro 4?
The Qwen3.8 Flash and Solar Pro 4 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Qwen3.8 Flash or Solar Pro 4 page. See also the complete list of AI model comparisons.