Compare / head-to-head
Claude Sonnet 5.5vs
GPT-5.2 Pro
Claude Sonnet 5.5 leads 1 of 1 shared benchmark. Claude Sonnet 5.5 is 15.8x cheaper per token. Claude Sonnet 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 – 0
Claude Sonnet 5.5 leads
Cheaper per token
Claude Sonnet 5.5
15.8x cheaper, input + output
Larger context
Claude Sonnet 5.5
1M tokens
Providers
2 providers
Anthropic · OpenAI
Claude Sonnet 5.5
Anthropic · released 2026-09-28
textvision
GPT-5.2 Pro
OpenAI · released 2025-12-11
textvision
Quality
Benchmark matrix
1 shared · 5 only Claude Sonnet 5.5 · 9 only GPT-5.2 Pro| Benchmark | Claude Sonnet 5.5 | GPT-5.2 Pro | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| Humanity's Last Exam (with tools) | 64.5% ↗ | 50% ↗ | +14.5 pt | Claude Sonnet 5.5 |
| Only Claude Sonnet 5.5 reports · 5 | ||||
| Chartography (no tools) | 61.6% ↗ | not reported | — | — |
| CursorBench 4.0 | 55.5% ↗ | not reported | — | — |
| FrontierCode v1.1 (Main) | 46.2% ↗ | not reported | — | — |
| OSWorld 2.1 (partial) | 80.1% ↗ | not reported | — | — |
| Terminal-Bench 4.0 | 70.6% ↗ | not reported | — | — |
| Only GPT-5.2 Pro reports · 9 | ||||
| GPQA Diamond | not reported | 93.2% ↗ | — | — |
| AIME 2025 | not reported | 100% ↗ | — | — |
| Humanity's Last Exam (no tools) | not reported | 36.6% ↗ | — | — |
| ARC-AGI-1 (Verified) | not reported | 90.5% ↗ | — | — |
| ARC-AGI-2 (Verified) | not reported | 54.2% ↗ | — | — |
| BrowseComp | not reported | 77.9% ↗ | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 46% ↗epoch | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 74% ↗epoch | — | — |
| GDPval (wins or ties) | not reported | 74.1% ↗ | — | — |
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 Claude Sonnet 5.5 minus GPT-5.2 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 | Claude Sonnet 5.5 | GPT-5.2 Pro | Edge |
|---|---|---|---|
| Context window | 1M tokens | 400K tokens | Claude Sonnet 5.5 |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $2 ↗ | $21 ↗ | Claude Sonnet 5.5 |
| Output price / 1M | $10 ↗ | $168 ↗ | Claude Sonnet 5.5 |
| Cached input / 1M | $0.2 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | $189 | Claude Sonnet 5.5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-09-28 | 2025-12-11 | — |
| Cited benchmark scores | 6 | 10 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Sonnet 5.5 vs …
Models sharing the most benchmarksMore matchups
GPT-5.2 Pro vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Sonnet 5.5 and GPT-5.2 Pro on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.