Gemini 3.5 Flash vs GPT-5
Gemini 3.5 Flash is cheaper on output tokens, while Gemini 3.5 Flash offers a larger context window. Choose Gemini 3.5 Flash or GPT-5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Gemini 3.5 Flash | GPT-5 |
|---|---|---|
| Provider | OpenAI | |
| Input / 1M tokens | $1.50 | $1.25 |
| Output / 1M tokens | $9.00 | $10.00 |
| Context window | 1M | 400K |
| Parameters | — | — |
| Open weights | No | No |
| Released | May 2026 | Aug 2025 |
| LiveBench score | 75.8 | — |
| GPQA Diamond score | 92.8 | 86.2 |
| FrontierMath score | 39.0 | 32.4 |
| Epoch Capabilities Index score | 154 | 150 |
| LMArena (Chatbot Arena) Elo score | 1482 | 1406 |
| LMArena WebDev Elo score | 1499 | 1417 |
| LMArena Vision Elo score | 1310 | 1208 |
| Aider Polyglot score | — | 88.0 |
| SWE-bench Verified score | — | 75.6 |
FAQ
Is Gemini 3.5 Flash or GPT-5 cheaper?
Gemini 3.5 Flash is cheaper on output tokens ($9.00 vs $10.00 per 1M).
Which has the larger context window, Gemini 3.5 Flash or GPT-5?
Gemini 3.5 Flash has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.