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 | Aura-2aura-2 | GPT-6 Lunagpt-6-luna | GPT-6 Astragpt-6-astra |
|---|---|---|---|
| Pricing | |||
| Input | $0 / 1M | $0.10 / 1M | $10.00 / 1M |
| Output | $0 / 1M | $0.50 / 1M | $50.00 / 1M |
| Cache Write (5m) | Not applicable | $0.10 / 1M | $10.00 / 1M |
| Cache Write (1h) | Not applicable | $0.10 / 1M | $10.00 / 1M |
| Cache Read | Not applicable | $0.10 / 1M | $10.00 / 1M |
| Web Search | $0 / 1M | $0 / 1M | $0 / 1M |
| Context | |||
| Max context | N/A | 1.1M | 1M |
| Max output | N/A | N/A | N/A |
| Capabilities | |||
| Vision | No | Yes | Yes |
| Function Calling | No | Yes | Yes |
| JSON Mode | No | Yes | Yes |
| Streaming | No | Yes | Yes |
| Catalogue | |||
| Provider | Deepgram | OpenAI | OpenAI |
| Category | voice | chat | chat |
| Charge type | Pay As You Go | Pay As You Go | Pay As You Go |
| Released | 2026-07-16 | — | — |
| Description | |||
| Summary | Deepgram Aura-2 text-to-speech for real-time voice applications. Billed per input character. | GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, optimized for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks. It combines low-cost, responsive inference with the GPT-6 family’s improvements in factual reliability and clear, concise communication. At higher reasoning effort, GPT-6 Luna can also handle complex software engineering and computer-use workflows that previously required a Sol-tier model, making it a versatile choice for scalable production applications that need to balance speed, cost, and capability. | GPT-6 Astra is OpenAI's flagship model for demanding end-to-end professional work, designed for advanced analysis, software engineering, deep research, scientific tasks, and document creation. It is particularly strong in long-horizon agentic workflows, including tasks that require sustained reasoning, tool orchestration, and computer and browser use, making it well suited for complex autonomous workflows and production-grade knowledge work. |