Gemini 1.5 Flash 8B 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 48.4)
- •Gemini 1.5 Flash 8B is cheaper ($0.07 vs $1.25 per 1M input)
- •GPT-5.1-Codex is faster
- •Gemini 1.5 Flash 8B has a larger context window (1M)
| Gemini 1.5 Flash 8B | GPT-5.1-Codex | |
|---|---|---|
| Intelligence index | 48.4 | 88.2 |
| Developer | OpenAI | |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,048,576 tokens | 400,000 tokens |
| Input price | $0.07 / 1M | $1.25 / 1M |
| Output price | $0.30 / 1M | $10.00 / 1M |
| Speed | 150 tok/s | 188 tok/s |
| Released | March 15, 2024 | November 13, 2025 |
| Parameters | 8000000000 | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Gemini 1.5 Flash 8B
GPT-5.1-Codex
GPQA Diamond
38.4
86
Humanity’s Last Exam
4.5
23.4
LiveCodeBench
21.7
84.9
MMLU-Pro
58.7
86