GPT-5.5 vs Grok 3
Side-by-side comparison of OpenAI's GPT-5.5 and xAI's Grok 3. Which one is right for you?
Benchmark Comparison
Coding
GPT-5.5 wins94
86
Reasoning
GPT-5.5 wins96
89
Multimodal
GPT-5.5 wins97
82
Speed
Grok 3 wins82
87
Overall
GPT-5.5 wins93
86
Pricing Comparison
GPT-5.5
API Input$5.00/1M
API Output$30.00/1M
Subscription$20/mo
Free tierYes
Grok 3
API Input$3.00/1M
API Output$15.00/1M
Subscription$30/mo
Free tierNo
Specifications
| Spec | GPT-5.5 | Grok 3 |
|---|---|---|
| Provider | OpenAI | xAI |
| Released | 2026-03 | 2025-02 |
| Category | Frontier | Frontier |
| Context Window | 1M | 256K |
| Open Source | No | No |
| Multimodal | Yes | Yes |
| Best For | General purpose, Computer use, Autonomous agents | Real-time information, Social media analysis, Conversational AI |
GPT-5.5
Best all-rounder
Strong at autonomous tasks
Large context window
Expensive API
Rate limits on free tier
Grok 3
Real-time web access
Integrated with X platform
Strong reasoning
Less refined than GPT/Claude
Limited ecosystem