DeepSeek V4 Pro vs GPT-5.5
Side-by-side comparison of DeepSeek's DeepSeek V4 Pro and OpenAI's GPT-5.5. Which one is right for you?
Benchmark Comparison
Coding
GPT-5.5 wins93
94
Reasoning
GPT-5.5 wins91
96
Multimodal
GPT-5.5 wins75
97
Speed
DeepSeek V4 Pro wins85
82
Overall
GPT-5.5 wins87
93
Pricing Comparison
DeepSeek V4 Pro
API Input$0.44/1M
API Output$0.87/1M
SubscriptionFree
Free tierYes
GPT-5.5
API Input$5.00/1M
API Output$30.00/1M
Subscription$20/mo
Free tierYes
Specifications
| Spec | DeepSeek V4 Pro | GPT-5.5 |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Released | 2026-04 | 2026-03 |
| Category | Open Source | Frontier |
| Context Window | 128K | 1M |
| Open Source | Yes | No |
| Multimodal | No | Yes |
| Best For | Coding, Self-hosting, Budget-conscious | General purpose, Computer use, Autonomous agents |
DeepSeek V4 Pro
Best price-to-performance
Open weights
Excellent coding
Weaker multimodal
Smaller context window
GPT-5.5
Best all-rounder
Strong at autonomous tasks
Large context window
Expensive API
Rate limits on free tier