Overview
OpenAI's GPT-5.5 and xAI's Grok 4.5 represent two different philosophies. GPT-5.5 delivers top-tier benchmarks (GPQA Diamond 93.6, ARC-AGI-2 85.0), while Grok 4.5 features real-time X (Twitter) integration and competitive pricing at $2/1M tokens.
Specs & Pricing
| GPT-5.5 | Grok 4.5 | |
|---|---|---|
| Developer | OpenAI | xAI |
| Type | foundation | foundation |
| Parameters | 非公開 | 非公開 |
| Context Window | — | — |
| Open Source | — | — |
| Input Price (/1M tokens) | $2.5 | $2 |
| Output Price (/1M tokens) | — | — |
Recommendations by Use Case
Which model fits your task best
GPT-5.5 surpasses Grok 4.5 on verified benchmarks: GPQA Diamond 93.6, ARC-AGI-2 85.0, HLE 52.2.
Grok 4.5 costs $2/1M tokens — 20% cheaper than GPT-5.5's $2.5/1M.
GPT-5.5 benefits from OpenAI's years of RLHF optimization, delivering high-quality business and creative writing.
Frequently Asked Questions
Is Grok 4.5 better at real-time information than GPT-5.5?
Yes. Grok 4.5's X platform integration gives it faster access to breaking news and trends. GPT-5.5 also has browsing capabilities, but Grok's X integration is more seamless.
Which is better overall?
GPT-5.5 leads overall in benchmark performance and writing quality. Grok 4.5's strengths are real-time information access and cost-performance.