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 | Perceptron Mk1.5perceptron-mk1.5 | GPT-6 Lunagpt-6-luna | S2.1 Pros2.1-pro |
|---|---|---|---|
| Pricing | |||
| Input | $0.15 / 1M | $0.10 / 1M | $0 / 1M |
| Output | $1.50 / 1M | $0.50 / 1M | $0 / 1M |
| Cache Write (5m) | $0.15 / 1M | $0.10 / 1M | Not applicable |
| Cache Write (1h) | $0.15 / 1M | $0.10 / 1M | Not applicable |
| Cache Read | $0.15 / 1M | $0.10 / 1M | Not applicable |
| Web Search | $0 / 1M | $0 / 1M | $0 / 1M |
| Context | |||
| Max context | 36.9K | 1.1M | N/A |
| Max output | N/A | N/A | N/A |
| Capabilities | |||
| Vision | No | Yes | No |
| Function Calling | No | Yes | No |
| JSON Mode | No | Yes | No |
| Streaming | Yes | Yes | No |
| Catalogue | |||
| Provider | Perceptron | OpenAI | Fish Audio |
| Category | chat | chat | voice |
| Charge type | Pay As You Go | Pay As You Go | Pay As You Go |
| Released | 2026-09-25 | — | 2026-07-29 |
| Description | |||
| Summary | Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token. | 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. | Fish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text. |