Compare / head-to-head
gpt-oss-20bvsQwen3.5-Flash
Qwen3.5-Flash leads 3 of 3 shared benchmarks. 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 – 3
Qwen3.5-Flash leads
Cheaper per token
—
list price, input + output
Larger context
Qwen3.5-Flash
1M tokens
Provider uptime (30d)
94.2446% · —
OpenAI · Qwen
gpt-oss-20b
OpenAI · released 2025-08-05
text
- Context
- 131K
- Max out
- 131K
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 5 core
Qwen3.5-Flash
Qwen · released 2026-02-23
textvision
Quality
Benchmark matrix
3 shared · 2 only gpt-oss-20b · 2 only Qwen3.5-Flash| Benchmark | gpt-oss-20b | Qwen3.5-Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| GPQA Diamond | 71.5% ↗ | 82.3% ↗epoch | -10.8 pt | Qwen3.5-Flash |
| LMArena Elo | 1287.3 ↗ | 1397.7 ↗ | -110.4 | Qwen3.5-Flash |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 65.3% ↗epoch | 84.4% ↗epoch | -19.1 pt | Qwen3.5-Flash |
| Only gpt-oss-20b reports · 2 | ||||
| SWE-bench Verified | 60.7% ↗ | not reported | — | — |
| AIME 2025 | 89.2% ↗matharena ⚠ | not reported | — | — |
| Only Qwen3.5-Flash reports · 2 | ||||
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 9.5% ↗epoch | — | — |
| SimpleQA Verified | not reported | 20.3% ↗epoch | — | — |
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 gpt-oss-20b minus Qwen3.5-Flash 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 | gpt-oss-20b | Qwen3.5-Flash | Edge |
|---|---|---|---|
| Context window | 131K tokens | 1M tokens | Qwen3.5-Flash |
| Max output | 131K tokens | — | — |
| Input price / 1M | — | $0.029 ↗ | — |
| Output price / 1M | — | $0.287 ↗ | — |
| Cached input / 1M | — | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | — | $0.316 | — |
| Modalities | text | text · vision | Qwen3.5-Flash |
| Released | 2025-08-05 | 2026-02-23 | — |
| Cited benchmark scores | 6 | 5 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
gpt-oss-20b vs …
Models sharing the most benchmarksMore 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 gpt-oss-20b and Qwen3.5-Flash on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.