Compare models
Put up to 4 models beside each other — token prices, context windows, capabilities and provider, from the same catalogue the model pages read.
| Attribute | GPT-5.6 Luna Progpt-5.6-luna-pro | Universal-3.5 Prouniversal-3-5-pro |
|---|---|---|
| Pricing | ||
| Input | $0.20 / 1M | — Not priced per input token |
| Output | $1.20 / 1M | — Not priced per output token |
| Cache Write (5m) | $0.20 / 1M | Not applicable |
| Cache Write (1h) | $0.20 / 1M | Not applicable |
| Cache Read | $0.20 / 1M | Not applicable |
| Web Search | $0 / 1M | $0 / 1M |
| Context | ||
| Max context | 1M | N/A |
| Max output | N/A | N/A |
| Capabilities | ||
| Vision | Yes | No |
| Function Calling | Yes | No |
| JSON Mode | Yes | No |
| Streaming | Yes | No |
| Catalogue | ||
| Provider | OpenAI | AssemblyAI |
| Category | chat | voice |
| Charge type | Pay As You Go | Pay As You Go |
| Released | — | 2026-09-22 |
| Description | ||
| Summary | GPT-5.6 Luna Pro uses the same underlying model as GPT-5.6 Luna, but runs with reasoning.mode set to pro to deliver higher-quality responses on complex tasks. It is optimized for deeper reasoning, advanced coding, and multi-step agentic workflows, offering improved accuracy and solution quality while retaining the efficiency and scalability of the Luna tier. | AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio. |