GPT-5.5 vs GPT-5.5 Instant
Both have similar output pricing, while GPT-5.5 offers a larger context window. Choose GPT-5.5 or GPT-5.5 Instant based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.5 | GPT-5.5 Instant |
|---|---|---|
| Provider | OpenAI | ZenMux |
| Input / 1M tokens | $5.00 | $5.00 |
| Output / 1M tokens | $30.00 | $30.00 |
| Context window | 1.1M | 400K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Apr 2026 | May 2026 |
| LiveBench score | 81.3 | — |
| LMArena (Chatbot Arena) Elo score | 1471 | 1419 |
| LMArena WebDev Elo score | 1513 | — |
| LMArena Vision Elo score | 1297 | 1250 |
| Epoch Capabilities Index score | 159 | 142 |
| GPQA Diamond score | 90.7 | 82.5 |
FAQ
Is GPT-5.5 or GPT-5.5 Instant cheaper?
GPT-5.5 and GPT-5.5 Instant have comparable output pricing.
Which has the larger context window, GPT-5.5 or GPT-5.5 Instant?
GPT-5.5 has the larger context window (1.1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.