GPT-5.5 vs Gemini 3.1 Ultra
A detailed side-by-side comparison to help you choose the right tool for your workflow.
| Feature | GPT-5.5 OpenAI's latest fully retrained foundation model with parallel reasoning | Gemini 3.1 Ultra Google's 2M-token multimodal model across text, image, audio, and video |
|---|---|---|
| Rating | 4.7(2890) | |
| Pricing | Freemium Free via ChatGPT, Plus $20/mo, Pro $200/mo, API $5/$30 per 1M tokens | Freemium Free via Google AI Studio, Advanced $20/mo, API $2/$12 per 1M tokens |
| Category | AI Chat & Assistants | AI Chat & Assistants |
| Use Case | Research | Research |
| Has API | ||
| Mobile App | ||
| Open Source | ||
| SSO Support | ||
| Trains on Your Data | ||
| Team Size | — | — |
| Deployment | — | — |
| Time to Value | — | — |
| Best For | — | — |
| Verified |
GPT-5.5 vs Gemini 3.1 Ultra: Which Should You Choose?
Based on community ratings, GPT-5.5 (4.7/5 from 2890 reviews) has the edge over Gemini 3.1 Ultra (4.5/5 from 1567 reviews). That said, the difference is slim and both tools are well regarded.
Pricing: Both tools are freemium options. Check the pricing tiers above to find the best value for your needs.
Bottom line: Both tools serve the Research use case. GPT-5.5 is the safer pick based on community data, but Gemini 3.1 Ultra may suit your workflow better.
Is GPT-5.5 better than Gemini 3.1 Ultra?
GPT-5.5 has a higher community rating (4.7 vs 4.5) based on 4457 total reviews on AIPowerStacks. However, "better" depends on your specific use case, budget, and team size.
Can I use GPT-5.5 and Gemini 3.1 Ultra together?
While both tools serve similar purposes, many users run both during a trial period before committing. If budget allows, using both gives you redundancy and lets you pick the right tool for each task.
Which is cheaper, GPT-5.5 or Gemini 3.1 Ultra?
Both tools have similar pricing models. Use our pricing comparison above to see exact tier-by-tier costs.