Compare / head-to-head
DeepSeek V4 ProvsGPT-5.5 Pro
GPT-5.5 Pro leads 2 of 3 shared benchmarks. DeepSeek V4 Pro is 160.9x 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
1 – 2
GPT-5.5 Pro leads
Cheaper per token
DeepSeek V4 Pro
160.9x cheaper, input + output
Larger context
GPT-5.5 Pro
1.1M tokens
Provider uptime (30d)
100% · 95.0464%
DeepSeek · OpenAI
DeepSeek V4 Pro
DeepSeek · released 2026-08-13
text
GPT-5.5 Pro
OpenAI · released 2026-04-23
textvision
Quality
Benchmark matrix
3 shared · 8 only DeepSeek V4 Pro · 5 only GPT-5.5 Pro| Benchmark | DeepSeek V4 Pro | GPT-5.5 Pro | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| FrontierMath Tier 4 v2 (Epoch AI run) | 2.4% ↗epoch | 78% ↗epoch | -75.6 pt | GPT-5.5 Pro |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 45.3% ↗epoch | 87.7% ↗epoch | -42.4 pt | GPT-5.5 Pro |
| Humanity's Last Exam (with tools) | 60% ↗ | 57.2% ↗ | +2.8 pt | DeepSeek V4 Pro |
| Only DeepSeek V4 Pro reports · 8 | ||||
| GPQA Diamond | 90.9% ↗epoch | not reported | — | — |
| AIME 2026 | 96.7% ↗matharena ⚠ | not reported | — | — |
| LMArena Elo | 1450.6 ↗ | not reported | — | — |
| DeepSWE v1.1 | 62.7% ↗ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 96.7% ↗epoch | not reported | — | — |
| SimpleQA Verified | 47% ↗epoch | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 77.6% ↗epoch | not reported | — | — |
| Terminal-Bench 2.1 | 87.9% ↗ | not reported | — | — |
| Only GPT-5.5 Pro reports · 5 | ||||
| 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% ↗ | — | — |
| GDPval (wins or ties) | not reported | 82.3% ↗ | — | — |
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 DeepSeek V4 Pro 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 | DeepSeek V4 Pro | GPT-5.5 Pro | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1.1M tokens | GPT-5.5 Pro |
| Max output | 384K tokens | 128K tokens | DeepSeek V4 Pro |
| Input price / 1M | $0.435 ↗ | $30 ↗ | DeepSeek V4 Pro |
| Output price / 1M | $0.87 ↗ | $180 ↗ | DeepSeek V4 Pro |
| Cached input / 1M | $0.004 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $1.31 | $210 | DeepSeek V4 Pro |
| Modalities | text | text · vision | GPT-5.5 Pro |
| Released | 2026-08-13 | 2026-04-23 | — |
| Cited benchmark scores | 11 | 8 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
DeepSeek V4 Pro vs …
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GPT-5.5 Pro vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
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