Compare models
Prices, specs and price history side by side. Data as of 2026-08-02
| Spec | GPT-5.5 ProOpenAI | GPT-5.6 Terra ProOpenAI |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context window | 1.1M | 1.1M |
| Max output | 128K | 128K |
| Modalities | file, image, text → text | file, image, text → text |
| Open source | No | No |
| License | - | - |
| Released | - | - |
| Status | active | active |
| Input$ / 1M | 30 | 2.5cheapest |
| Output$ / 1M | 180 | 15cheapest |
| Cached$ / 1M | - | 0.25 |
| Channel | openrouter | openrouter |
Price history
Overlaid price history. Solid = verified by us, dashed = estimated (archive).
GPT-5.5 ProGPT-5.6 Terra Proverified by usestimated (archive)