Compare / head-to-head
GPT-4ovsGPT-5.1
GPT-5.1 leads 5 of 5 shared benchmarks. GPT-5.1 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
0 – 5
GPT-5.1 leads
Cheaper per token
GPT-5.1
1.1x cheaper, input + output
Larger context
GPT-5.1
400K tokens
Provider uptime (30d)
94.2446%
OpenAI
GPT-4o
OpenAI · released 2024-05-13
textvision
Quality
Benchmark matrix
5 shared · 3 only GPT-4o · 1 only GPT-5.1| Benchmark | GPT-4o | GPT-5.1 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 46% ↗ | 87.6% ↗epoch | -41.6 pt | GPT-5.1 |
| AIME 2025 | 11.7% ↗matharena | 94.2% ↗matharena ⚠ | -82.5 pt | GPT-5.1 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 6.4% ↗epoch | 88.6% ↗epoch | -82.2 pt | GPT-5.1 |
| SimpleQA Verified | 26% ↗epoch | 48% ↗epoch | -22 pt | GPT-5.1 |
| SWE-bench Verified (Epoch AI run) | 31% ↗epoch | 68% ↗epoch | -37 pt | GPT-5.1 |
| Only GPT-4o reports · 3 | ||||
| MMLU | 85.7% ↗ | not reported | — | — |
| AIME 2024 | 13.1% ↗ | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 0.4% ↗epoch | not reported | — | — |
| Only GPT-5.1 reports · 1 | ||||
| LMArena Elo | not reported | 1422.6 ↗ | — | — |
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-4o minus GPT-5.1 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-4o | GPT-5.1 | Edge |
|---|---|---|---|
| Context window | 128K tokens | 400K tokens | GPT-5.1 |
| Max output | 16K tokens | 128K tokens | GPT-5.1 |
| Input price / 1M | $2.5 ↗ | $1.25 ↗ | GPT-5.1 |
| Output price / 1M | $10 ↗ | $10 ↗ | Tie |
| Cached input / 1M | $1.25 ↗ | $0.125 ↗ | GPT-5.1 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12.5 | $11.25 | GPT-5.1 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2024-05-13 | 2025-11-13 | — |
| Cited benchmark scores | 9 | 6 | — |
Reliability
OpenAI status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-4o vs …
Models sharing the most benchmarksMore matchups
GPT-5.1 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-4o and GPT-5.1 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.