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.
- GPT-5.6 TerraOpenAIRemove
- GPT-6 LunaOpenAIRemove
- Perceptron Mk1.5PerceptronRemove
- GPT-6.1 SolOpenAIRemove
4 is the maximum. Remove one to add another.
| Attribute | GPT-5.6 Terragpt-5.6-terra | GPT-6 Lunagpt-6-luna | Perceptron Mk1.5perceptron-mk1.5 | GPT-6.1 Solgpt-6.1-sol |
|---|---|---|---|---|
| Pricing | ||||
| Input | $2.00 / 1M | $0.10 / 1M | $0.15 / 1M | $2.00 / 1M |
| Output | $12.00 / 1M | $0.50 / 1M | $1.50 / 1M | $10.00 / 1M |
| Cache Write (5m) | $2.00 / 1M | $0.10 / 1M | $0.15 / 1M | $2.00 / 1M |
| Cache Write (1h) | $2.00 / 1M | $0.10 / 1M | $0.15 / 1M | $2.00 / 1M |
| Cache Read | $2.00 / 1M | $0.10 / 1M | $0.15 / 1M | $2.00 / 1M |
| Web Search | $0 / 1M | $0 / 1M | $0 / 1M | $0 / 1M |
| Context | ||||
| Max context | 1M | 1.1M | 36.9K | 1M |
| Max output | N/A | N/A | N/A | N/A |
| Capabilities | ||||
| Vision | Yes | Yes | No | Yes |
| Function Calling | Yes | Yes | No | Yes |
| JSON Mode | Yes | Yes | No | Yes |
| Streaming | Yes | Yes | Yes | Yes |
| Catalogue | ||||
| Provider | OpenAI | OpenAI | Perceptron | OpenAI |
| Category | chat | chat | chat | chat |
| Charge type | Pay As You Go | Pay As You Go | Pay As You Go | Pay As You Go |
| Released | — | — | 2026-09-25 | — |
| Description | ||||
| Summary | GPT-5.6 Terra is the balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is designed for everyday coding, reasoning, and agentic workflows, delivering strong performance while balancing capability and cost. Offering near-flagship quality at approximately half the cost of Sol, GPT-5.6 Terra is well suited for production applications that require reliable reasoning, software development, and scalable agent execution. | 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. | Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token. | GPT-6.1 Sol is an upgraded high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra. It is optimized for agentic coding, computer use, document-heavy professional work, and multi-step business automation, delivering near-Astra-level capability at significantly lower cost. Compared with GPT-6 Sol, it offers improved factual reliability and stronger adherence to explicit constraints and user intent, making it well suited for complex, long-running agentic workflows where accurate and dependable execution is critical. |