Gemini 3.5 Flash vs GPT-5.5
Price, context and benchmark scores side by side — every number from the live model catalogue.
| Gemini 3.5 Flashgoogle | GPT-5.5openai | |
|---|---|---|
| Input / 1M tokens | $1.50 | $5.00 |
| Output / 1M tokens | $9.00 | $30.00 |
| 1M in + 300K out | $4.20 | $14.00 |
| Context window | 1.0M | 1.1M |
| Intelligence index | 50.2 | 54.8 |
| Coding index | 70.1 | 74.9 |
| Agentic index | 37.4 | 44.9 |
| Cheapest provider | Azure | |
| Providers serving it | 2 | 2 |
| Weights | Closed | Closed |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
| Released | May 19, 2026 | Apr 24, 2026 |
Which one to pick
Pick Gemini 3.5 Flash if…
- Token cost matters: $9.00 per 1M output vs $30.00.
Pick GPT-5.5 if…
- You want the higher general-intelligence score (54.8).
- Code quality is the priority — it leads on the coding index (74.9).
- You are running agent loops — higher agentic index (44.9).
- You need the bigger context window (1.1M).
FAQ
Is Gemini 3.5 Flash better than GPT-5.5?
GPT-5.5 scores higher on general intelligence (50.2 vs 54.8), while Gemini 3.5 Flash is 3.3× cheaper per output token ($9.00 vs $30.00). For code, GPT-5.5 leads (74.9 coding index). GPT-5.5 takes the larger context at 1.1M.
Which is cheaper, Gemini 3.5 Flash or GPT-5.5?
Gemini 3.5 Flash, at $9.00 per 1M output tokens versus $30.00. On a 1M input + 300K output workload that is $4.20 against $14.00.
Can I self-host Gemini 3.5 Flash or GPT-5.5?
Gemini 3.5 Flash: closed weights, API only. GPT-5.5: closed weights, API only.