GPT-5.1 vs Phi-3
OpenAI vs Microsoft — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has a larger context window (400K)
| GPT-5.1 | Phi-3 | |
|---|---|---|
| Intelligence index | 89 | — |
| Developer | OpenAI | Microsoft |
| Type | LLM | LLM |
| Access | API only | Open weights |
| Context window | 400,000 tokens | 128,000 tokens |
| Input price | $1.25 / 1M | — |
| Output price | $10.00 / 1M | — |
| Speed | 115 tok/s | — |
| Released | November 12, 2025 | April 23, 2024 |
| Parameters | — | 3.8B |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |