Compare / head-to-head
GPT-5.1vso3
GPT-5.1 leads 4 of 5 shared benchmarks. o3 is 1.1x 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
4 – 1
GPT-5.1 leads
Cheaper per token
o3
1.1x cheaper, input + output
Larger context
GPT-5.1
400K tokens
Provider uptime (30d)
94.2446%
OpenAI
GPT-5.1
OpenAI · released 2025-11-13
textvision
Quality
Benchmark matrix
5 shared · 1 only GPT-5.1 · 2 only o3| Benchmark | GPT-5.1 | o3 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 87.6% ↗epoch | 81.8% ↗epoch | +5.8 pt | GPT-5.1 |
| AIME 2025 | 94.2% ↗matharena ⚠ | 89.2% ↗matharena ⚠ | +5 pt | GPT-5.1 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 88.6% ↗epoch | 84.4% ↗epoch | +4.2 pt | GPT-5.1 |
| SimpleQA Verified | 48% ↗epoch | 49.4% ↗epoch | -1.4 pt | o3 |
| SWE-bench Verified (Epoch AI run) | 68% ↗epoch | 62.3% ↗epoch | +5.7 pt | GPT-5.1 |
| Only GPT-5.1 reports · 1 | ||||
| LMArena Elo | 1422.6 ↗ | not reported | — | — |
| Only o3 reports · 2 | ||||
| SWE-bench Verified | not reported | 69.1% ↗ | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 33.3% ↗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-5.1 minus o3 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 | o3 | Edge |
|---|---|---|---|
| Context window | 400K tokens | 200K tokens | GPT-5.1 |
| Max output | 128K tokens | 100K tokens | GPT-5.1 |
| Input price / 1M | $1.25 ↗ | $2 ↗ | GPT-5.1 |
| Output price / 1M | $10 ↗ | $8 ↗ | o3 |
| Cached input / 1M | $0.125 ↗ | $0.5 ↗ | GPT-5.1 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $11.25 | $10 | o3 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-11-13 | 2025-04-16 | — |
| Cited benchmark scores | 6 | 7 | — |
Reliability
OpenAI status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5.1 vs …
Models sharing the most benchmarksMore matchups
o3 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 o3 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.