GPT-5.1 vs GPT-5.5 Instant
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 is cheaper ($1.25 vs $5.00 per 1M input)
| GPT-5.1 | GPT-5.5 Instant | |
|---|---|---|
| Intelligence index | 89 | — |
| Developer | OpenAI | OpenAI |
| Type | LLM | LLM |
| Access | API only | — |
| Context window | 400,000 tokens | — |
| Input price | $1.25 / 1M | $5.00 / 1M |
| Output price | $10.00 / 1M | $30.00 / 1M |
| Speed | 115 tok/s | — |
| Released | November 12, 2025 | May 5, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | — |
| Output modalities | Text | — |