Compare / head-to-head
GPT-5.5 ProvsGPT-5 Pro
GPT-5.5 Pro leads 2 of 2 shared benchmarks. GPT-5 Pro is 1.6x 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
2 – 0
GPT-5.5 Pro leads
Cheaper per token
GPT-5 Pro
1.6x cheaper, input + output
Larger context
GPT-5.5 Pro
1.1M tokens
Provider uptime (30d)
94.2446%
OpenAI
GPT-5.5 Pro
OpenAI · released 2026-04-23
textvision
Quality
Benchmark matrix
2 shared · 6 only GPT-5.5 Pro · 1 only GPT-5 Pro| Benchmark | GPT-5.5 Pro | GPT-5 Pro | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 2 | ||||
| FrontierMath Tier 4 v2 (Epoch AI run) | 78% ↗epoch | 19.5% ↗epoch | +58.5 pt | GPT-5.5 Pro |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 87.7% ↗epoch | 55.8% ↗epoch | +31.9 pt | GPT-5.5 Pro |
| Only GPT-5.5 Pro reports · 6 | ||||
| Humanity's Last Exam (no tools) | 43.1% ↗ | not reported | — | — |
| BrowseComp | 90.1% ↗ | not reported | — | — |
| FrontierMath Tier 1-3 | 52.4% ↗ | not reported | — | — |
| FrontierMath Tier 4 | 39.6% ↗ | not reported | — | — |
| GDPval (wins or ties) | 82.3% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.2% ↗ | not reported | — | — |
| Only GPT-5 Pro reports · 1 | ||||
| GPQA Diamond | not reported | 88.4% ↗ | — | — |
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-5.5 Pro 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-5.5 Pro | GPT-5 Pro | Edge |
|---|---|---|---|
| Context window | 1.1M tokens | 400K tokens | GPT-5.5 Pro |
| Max output | 128K tokens | 272K tokens | GPT-5 Pro |
| Input price / 1M | $30 ↗ | $15 ↗ | GPT-5 Pro |
| Output price / 1M | $180 ↗ | $120 ↗ | GPT-5 Pro |
| Cached input / 1M | — | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $210 | $135 | GPT-5 Pro |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-04-23 | 2025-10-06 | — |
| Cited benchmark scores | 8 | 3 | — |
Reliability
OpenAI status
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Which one wins on your data?
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