Compare / head-to-head
GPT-5.1vsQwen3.5 27B
GPT-5.1 leads 2 of 2 shared benchmarks. Qwen3.5 27B is 14.5x cheaper per token. GPT-5.1 has the larger context window (400K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
2 – 0
GPT-5.1 leads
Cheaper per token
Qwen3.5 27B
14.5x cheaper, input + output
Larger context
GPT-5.1
400K tokens
Provider uptime (30d)
94.2446% · —
OpenAI · Qwen
GPT-5.1
OpenAI · released 2025-11-13
textvision
Qwen3.5 27B
Qwen
textvision
Quality
Benchmark matrix
2 shared · 4 only GPT-5.1 · 3 only Qwen3.5 27B| Benchmark | GPT-5.1 | Qwen3.5 27B | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 2 | ||||
| GPQA Diamond | 87.6% ↗epoch | 85.5% ↗ | +2.1 pt | GPT-5.1 |
| LMArena Elo | 1422.6 ↗ | 1408.1 ↗ | +14.5 | GPT-5.1 |
| Only GPT-5.1 reports · 4 | ||||
| AIME 2025 | 94.2% ↗matharena ⚠ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 88.6% ↗epoch | not reported | — | — |
| SimpleQA Verified | 48% ↗epoch | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 68% ↗epoch | not reported | — | — |
| Only Qwen3.5 27B reports · 3 | ||||
| SWE-bench Verified | not reported | 75% ↗ | — | — |
| MMLU-Pro | not reported | 86.1% ↗ | — | — |
| AIME 2026 | not reported | 91.7% ↗matharena ⚠ | — | — |
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-5.1 minus Qwen3.5 27B 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-5.1 | Qwen3.5 27B | Edge |
|---|---|---|---|
| Context window | 400K tokens | 262K tokens | GPT-5.1 |
| Max output | 128K tokens | — | — |
| Input price / 1M | $1.25 ↗ | $0.086 ↗ | Qwen3.5 27B |
| Output price / 1M | $10 ↗ | $0.688 ↗ | Qwen3.5 27B |
| Cached input / 1M | $0.125 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $11.25 | $0.774 | Qwen3.5 27B |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-11-13 | — | — |
| Cited benchmark scores | 6 | 5 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5.1 vs …
Models sharing the most benchmarksMore matchups
Qwen3.5 27B vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5.1 and Qwen3.5 27B on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.