Compare / head-to-head
DeepSeek V4 ProvsGPT-5.5
GPT-5.5 leads 5 of 7 shared benchmarks. DeepSeek V4 Pro is 26.8x cheaper per token. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
2 – 5
GPT-5.5 leads
Cheaper per token
DeepSeek V4 Pro
26.8x cheaper, input + output
Larger context
Tie
both 1M tokens
Provider uptime (30d)
100% · 95.1662%
DeepSeek · OpenAI
DeepSeek V4 Pro
DeepSeek · released 2026-08-13
text
Quality
Benchmark matrix
7 shared · 4 only DeepSeek V4 Pro · 14 only GPT-5.5| Benchmark | DeepSeek V4 Pro | GPT-5.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 7 | ||||
| GPQA Diamond | 90.9% ↗epoch | 90.7% ↗epoch | +0.2 pt | DeepSeek V4 Pro |
| AIME 2026 | 96.7% ↗matharena ⚠ | 100% ↗matharena ⚠ | -3.3 pt | GPT-5.5 |
| LMArena Elo | 1450.6 ↗ | 1465.6 ↗ | -15 | GPT-5.5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 2.4% ↗epoch | 72.5% ↗epoch | -70.1 pt | GPT-5.5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 45.3% ↗epoch | 85.3% ↗epoch | -40 pt | GPT-5.5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 96.7% ↗epoch | 84.4% ↗epoch | +12.3 pt | DeepSeek V4 Pro |
| SimpleQA Verified | 47% ↗epoch | 63% ↗epoch | -16 pt | GPT-5.5 |
| Only DeepSeek V4 Pro reports · 4 | ||||
| DeepSWE v1.1 | 62.7% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 60% ↗ | 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 reports · 14 | ||||
| ARC-AGI-1 (Verified) | not reported | 95% ↗ | — | — |
| ARC-AGI-2 (Verified) | not reported | 85% ↗ | — | — |
| BrowseComp | not reported | 84.4% ↗ | — | — |
| FrontierMath Tier 1-3 | not reported | 51.7% ↗ | — | — |
| FrontierMath Tier 4 | not reported | 35.4% ↗ | — | — |
| GDPval (wins or ties) | not reported | 84.9% ↗ | — | — |
| 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% ↗ | — | — |
| 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 DeepSeek V4 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 | DeepSeek V4 Pro | GPT-5.5 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 384K tokens | 128K tokens | DeepSeek V4 Pro |
| Input price / 1M | $0.435 ↗ | $5 ↗ | DeepSeek V4 Pro |
| Output price / 1M | $0.87 ↗ | $30 ↗ | DeepSeek V4 Pro |
| Cached input / 1M | $0.004 ↗ | $0.5 ↗ | DeepSeek V4 Pro |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $1.31 | $35 | DeepSeek V4 Pro |
| Modalities | text | text · vision | GPT-5.5 |
| Released | 2026-08-13 | 2026-04-23 | — |
| Cited benchmark scores | 11 | 21 | — |
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 vs …
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Which one wins on your data?
Public benchmarks are a starting point. Run DeepSeek V4 Pro and GPT-5.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.