Gemini 3.1 Flash Lite vs GPT-5.1-Codex
Google vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1-Codex has the higher intelligence index (88.2 vs 82.2)
- •Gemini 3.1 Flash Lite is cheaper ($0.25 vs $1.25 per 1M input)
- •Gemini 3.1 Flash Lite is faster
- •Gemini 3.1 Flash Lite has a larger context window (1M)
| Gemini 3.1 Flash Lite | GPT-5.1-Codex | |
|---|---|---|
| Intelligence index | 82.2 | 88.2 |
| Developer | OpenAI | |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,048,576 tokens | 400,000 tokens |
| Input price | $0.25 / 1M | $1.25 / 1M |
| Output price | $1.50 / 1M | $10.00 / 1M |
| Speed | 342 tok/s | 188 tok/s |
| Released | May 7, 2026 | November 13, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image, Video, Audio | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
Gemini 3.1 Flash Lite
GPT-5.1-Codex
GPQA Diamond
82.2
86
Humanity’s Last Exam
16.2
23.4