GPT-5.1 vs GPT-5.4
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 74.9)
- •GPT-5.1 is cheaper ($1.25 vs $2.50 per 1M input)
- •GPT-5.1 is faster
- •GPT-5.4 has a larger context window (1.1M)
| GPT-5.1 | GPT-5.4 | |
|---|---|---|
| Intelligence index | 89 | 74.9 |
| Developer | OpenAI | OpenAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 400,000 tokens | 1,050,000 tokens |
| Input price | $1.25 / 1M | $2.50 / 1M |
| Output price | $10.00 / 1M | $15.00 / 1M |
| Speed | 115 tok/s | 84 tok/s |
| Released | November 12, 2025 | March 5, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1
GPT-5.4
GPQA Diamond
88.1
92
Humanity’s Last Exam
26.5
41.6