Compare / head-to-head
GPT-5.2 ProvsGPT-5.5
GPT-5.5 leads 6 of 7 shared benchmarks. GPT-5.5 is 5.4x cheaper per token. GPT-5.5 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 6
GPT-5.5 leads
Cheaper per token
GPT-5.5
5.4x cheaper, input + output
Larger context
GPT-5.5
1M tokens
Provider uptime (30d)
95.2381%
OpenAI
GPT-5.2 Pro
OpenAI · released 2025-12-11
textvision
Quality
Benchmark matrix
7 shared · 3 only GPT-5.2 Pro · 14 only GPT-5.5| Benchmark | GPT-5.2 Pro | GPT-5.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 7 | ||||
| GPQA Diamond | 93.2% ↗ | 90.7% ↗epoch | +2.5 pt | GPT-5.2 Pro |
| ARC-AGI-1 (Verified) | 90.5% ↗ | 95% ↗ | -4.5 pt | GPT-5.5 |
| ARC-AGI-2 (Verified) | 54.2% ↗ | 85% ↗ | -30.8 pt | GPT-5.5 |
| BrowseComp | 77.9% ↗ | 84.4% ↗ | -6.5 pt | GPT-5.5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 46% ↗epoch | 72.5% ↗epoch | -26.5 pt | GPT-5.5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 74% ↗epoch | 85.3% ↗epoch | -11.3 pt | GPT-5.5 |
| GDPval (wins or ties) | 74.1% ↗ | 84.9% ↗ | -10.8 pt | GPT-5.5 |
| Only GPT-5.2 Pro reports · 3 | ||||
| AIME 2025 | 100% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 36.6% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 50% ↗ | not reported | — | — |
| Only GPT-5.5 reports · 14 | ||||
| AIME 2026 | not reported | 100% ↗matharena ⚠ | — | — |
| LMArena Elo | not reported | 1465.6 ↗ | — | — |
| FrontierMath Tier 1-3 | not reported | 51.7% ↗ | — | — |
| FrontierMath Tier 4 | not reported | 35.4% ↗ | — | — |
| MCP Atlas | not reported | 75.3% ↗ | — | — |
| MMMU-Pro (no tools) | not reported | 81.2% ↗ | — | — |
| MMMU-Pro (with tools) | not reported | 83.2% ↗ | — | — |
| OSWorld-Verified | not reported | 78.7% ↗ | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | not reported | 84.4% ↗epoch | — | — |
| SimpleQA Verified | not reported | 63% ↗epoch | — | — |
| SWE-Bench Pro | not reported | 58.6% ↗ | — | — |
| Tau2-bench Telecom | not reported | 98% ↗ | — | — |
| Terminal-Bench 2.0 | not reported | 82.7% ↗ | — | — |
| Toolathlon | not reported | 55.6% ↗ | — | — |
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-5.2 Pro minus GPT-5.5 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-5.2 Pro | GPT-5.5 | Edge |
|---|---|---|---|
| Context window | 400K tokens | 1M tokens | GPT-5.5 |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $21 ↗ | $5 ↗ | GPT-5.5 |
| Output price / 1M | $168 ↗ | $30 ↗ | GPT-5.5 |
| Cached input / 1M | — | $0.5 ↗ | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $189 | $35 | GPT-5.5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-12-11 | 2026-04-23 | — |
| Cited benchmark scores | 10 | 21 | — |
Reliability
OpenAI status
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Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5.2 Pro and GPT-5.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.