GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...
With CoreAI, you can start chatting with OpenAI: GPT-5.6 Luna instantly — no separate subscription needed. CoreAI lets you chat with OpenAI: GPT-5.6 Luna alongside 300+ other AI models from OpenAI and other providers like OpenAI, Anthropic, Google, Meta, and more.
Among the 396 chat models on CoreAI, OpenAI: GPT-5.6 Luna ranks #3 by context window — 1.1M tokens, roughly 787,500 words or 1,575 pages of text in a single conversation. On price, it is the #47 cheapest of 130 budget-tier models by input cost. It joined the catalog on 2026-07-09. It supports step-by-step reasoning (thinking mode) and accepts image input.
Every model in this table is available on CoreAI — open the web app and run the same prompt through OpenAI: GPT-5.6 Luna and OpenAI: GPT-5.6 Luna Pro side by side to judge with your own eyes.
A typical question (about 1,000 tokens in, 500 out) runs $0.00040 on OpenAI: GPT-5.6 Luna's raw per-token rates; a heavy session with a 50K-token document costs about $0.008. On CoreAI you don't juggle these numbers — one subscription covers OpenAI: GPT-5.6 Luna and 300+ other models under a plan usage limit, with no API keys. See plans.
OpenAI: GPT-5.6 Luna handles 1.1M tokens of context — roughly 787,500 words, or about 1,575 pages of text in one conversation.
OpenAI: GPT-5.6 Luna's underlying rates are $0.1 per 1M input tokens and $0.6 per 1M output tokens. On CoreAI it is included in one subscription alongside 300+ models, so there is no per-token billing to manage.
Yes — OpenAI: GPT-5.6 Luna accepts image input, so you can attach screenshots, photos or diagrams and ask questions about them.
Yes. OpenAI: GPT-5.6 Luna can work through problems step by step before answering; on CoreAI you can toggle thinking mode per message.
Open the CoreAI web app or the iOS/Android app, pick OpenAI: GPT-5.6 Luna in the model selector, and chat — no API key, no per-token billing. One subscription covers OpenAI: GPT-5.6 Luna and 300+ other models.
The closest alternatives on CoreAI are OpenAI: GPT-5.6 Luna Pro, Google: Gemini 3.7 Flash (batch), Upstage: Solar Pro 4 — similar tier and capability. The fastest way to choose is running one prompt through them side by side in CoreAI's Compare view.
Chat with OpenAI: GPT-5.6 Luna and 300+ other AI models — all in one app.