Compare / head-to-head
GPT-5.1vsGPT-5 Pro
GPT-5 Pro leads 1 of 1 shared benchmark. GPT-5.1 is 12x cheaper per token. Both offer a 400K-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 1
GPT-5 Pro leads
Cheaper per token
GPT-5.1
12x cheaper, input + output
Larger context
Tie
both 400K tokens
Provider uptime (30d)
94.4056%
OpenAI
GPT-5.1
OpenAI · released 2025-11-13
textvision
Quality
Benchmark matrix
1 shared · 5 only GPT-5.1 · 2 only GPT-5 Pro| Benchmark | GPT-5.1 | GPT-5 Pro | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| GPQA Diamond | 87.6% ↗epoch | 88.4% ↗ | -0.8 pt | GPT-5 Pro |
| Only GPT-5.1 reports · 5 | ||||
| AIME 2025 | 94.2% ↗matharena ⚠ | not reported | — | — |
| LMArena Elo | 1422.6 ↗ | 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 GPT-5 Pro reports · 2 | ||||
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 19.5% ↗epoch | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 55.8% ↗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-5.1 minus GPT-5 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 | GPT-5.1 | GPT-5 Pro | Edge |
|---|---|---|---|
| Context window | 400K tokens | 400K tokens | Tie |
| Max output | 128K tokens | 272K tokens | GPT-5 Pro |
| Input price / 1M | $1.25 ↗ | $15 ↗ | GPT-5.1 |
| Output price / 1M | $10 ↗ | $120 ↗ | GPT-5.1 |
| Cached input / 1M | $0.125 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $11.25 | $135 | GPT-5.1 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-11-13 | 2025-10-06 | — |
| Cited benchmark scores | 6 | 3 | — |
Reliability
OpenAI status
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GPT-5.1 vs …
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Which one wins on your data?
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