Compare / head-to-head
GPT-4o minivsGPT-5.5 Pro
GPT-5.5 Pro leads 1 of 1 shared benchmark. GPT-4o mini is 280x cheaper per token. GPT-5.5 Pro has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 1
GPT-5.5 Pro leads
Cheaper per token
GPT-4o mini
280x cheaper, input + output
Larger context
GPT-5.5 Pro
1.1M tokens
Provider uptime (30d)
94.8882%
OpenAI
GPT-4o mini
OpenAI · released 2024-07-18
textvision
GPT-5.5 Pro
OpenAI · released 2026-04-23
textvision
Quality
Benchmark matrix
1 shared · 5 only GPT-4o mini · 7 only GPT-5.5 Pro| Benchmark | GPT-4o mini | GPT-5.5 Pro | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 0.7% ↗epoch | 87.7% ↗epoch | -87 pt | GPT-5.5 Pro |
| Only GPT-4o mini reports · 5 | ||||
| GPQA Diamond | 40.2% ↗ | not reported | — | — |
| MMLU | 82% ↗ | not reported | — | — |
| AIME 2024 | 8.6% ↗ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 6.9% ↗epoch | not reported | — | — |
| SimpleQA Verified | 8.3% ↗epoch | not reported | — | — |
| Only GPT-5.5 Pro reports · 7 | ||||
| Humanity's Last Exam (no tools) | not reported | 43.1% ↗ | — | — |
| BrowseComp | not reported | 90.1% ↗ | — | — |
| FrontierMath Tier 1-3 | not reported | 52.4% ↗ | — | — |
| FrontierMath Tier 4 | not reported | 39.6% ↗ | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 78% ↗epoch | — | — |
| GDPval (wins or ties) | not reported | 82.3% ↗ | — | — |
| Humanity's Last Exam (with tools) | not reported | 57.2% ↗ | — | — |
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 mini minus GPT-5.5 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-4o mini | GPT-5.5 Pro | Edge |
|---|---|---|---|
| Context window | 128K tokens | 1.1M tokens | GPT-5.5 Pro |
| Max output | 16K tokens | 128K tokens | GPT-5.5 Pro |
| Input price / 1M | $0.15 ↗ | $30 ↗ | GPT-4o mini |
| Output price / 1M | $0.6 ↗ | $180 ↗ | GPT-4o mini |
| Cached input / 1M | $0.075 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.75 | $210 | GPT-4o mini |
| Modalities | text · vision | text · vision | Tie |
| Released | 2024-07-18 | 2026-04-23 | — |
| Cited benchmark scores | 7 | 8 | — |
Reliability
OpenAI status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-4o mini vs …
Models sharing the most benchmarksMore matchups
GPT-5.5 Pro vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-4o mini and GPT-5.5 Pro on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.