Compare / head-to-head
Qwen3.5-FlashvsSonar Reasoning Pro
Qwen3.5-Flash and Sonar Reasoning Pro do not yet share a public benchmark, so quality cannot be compared apples-to-apples. Qwen3.5-Flash is 31.6x cheaper per token. Qwen3.5-Flash has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0
no overlap yet
Cheaper per token
Qwen3.5-Flash
31.6x cheaper, input + output
Larger context
Qwen3.5-Flash
1M tokens
Provider uptime (30d)
— · 100%
Qwen · Perplexity
Qwen3.5-Flash
Qwen · released 2026-02-23
textvision
Sonar Reasoning Pro
Perplexity
text
Quality
Benchmark matrix
0 shared · 5 only Qwen3.5-Flash · 0 only Sonar Reasoning Pro| Benchmark | Qwen3.5-Flash | Sonar Reasoning Pro | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 0 | ||||
| No public benchmark is reported for both models yet. | ||||
| Only Qwen3.5-Flash reports · 5 | ||||
| GPQA Diamond | 82.3% ↗epoch | not reported | — | — |
| LMArena Elo | 1397.7 ↗ | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 9.5% ↗epoch | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 84.4% ↗epoch | not reported | — | — |
| SimpleQA Verified | 20.3% ↗epoch | not reported | — | — |
| Only Sonar Reasoning Pro reports · 0 | ||||
| Sonar Reasoning Pro reports nothing Qwen3.5-Flash does not. | ||||
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Qwen3.5-Flash minus Sonar Reasoning Pro in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Qwen3.5-Flash | Sonar Reasoning Pro | Edge |
|---|---|---|---|
| Context window | 1M tokens | 128K tokens | Qwen3.5-Flash |
| Max output | — | — | — |
| Input price / 1M | $0.029 ↗ | $2 ↗ | Qwen3.5-Flash |
| Output price / 1M | $0.287 ↗ | $8 ↗ | Qwen3.5-Flash |
| Cached input / 1M | — | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.316 | $10 | Qwen3.5-Flash |
| Modalities | text · vision | text | Qwen3.5-Flash |
| Released | 2026-02-23 | — | — |
| Cited benchmark scores | 5 | 0 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Qwen3.5-Flash vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Qwen3.5-Flash and Sonar Reasoning Pro on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.