GPT-5.5 vs Chat Latest (GPT-5.5 Instant)
Both have similar output pricing, while GPT-5.5 offers a larger context window. Choose GPT-5.5 or Chat Latest (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 | Chat Latest (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 | — |
| GPQA Diamond score | 90.7 | — |
| LMArena WebDev Elo score | 1513 | — |
| LMArena Vision Elo score | 1297 | — |
| Epoch Capabilities Index score | 160 | — |
FAQ
Is GPT-5.5 or Chat Latest (GPT-5.5 Instant) cheaper?
GPT-5.5 and Chat Latest (GPT-5.5 Instant) have comparable output pricing.
Which has the larger context window, GPT-5.5 or Chat Latest (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.