All models
OpenAI
GPT-5.6 Luna
The quick, cheap tier of OpenAI's GPT-5.6 line, for everyday chat and short tasks, with 1M context and image input. Not built for deep analysis. GPT-6 Luna is newer and costs about half as much.
MainstreamThe big labs' models with their own safety filters. Best for work, code and research.
Quick
Intelligence
~0.65 credits
Estimated price per message
1.1M tokens
Context window
Text, Images
Reads
GPT-5.6 Luna is a legacy model. Its successor, GPT-6 Luna, is faster or cheaper - and chats that used GPT-5.6 Luna move to it automatically.
See GPT-6 LunaThe facts
Made by
OpenAI
Content tier
MainstreamThe big labs' models with their own safety filters. Best for work, code and research.
Intelligence
Quick
Estimated price per message
~0.65 credits≈ 153 messages for $1
Context window
1.1M tokens≈ 1,615 pages of text in one go
Reads
Text, Images
Writes
Text
Tool use
Yes - search, memory, code and more
Served via
OpenRouter, Unbottled AI
Status
Legacy
A typical message: 16K tokens in, 1.5K out. Short replies cost less. Models served via OpenRouter bill the real provider cost plus our markup, so actual charges vary. 1 credit = $0.01.
Compare GPT-5.6 Luna
Same facts, side by side.
Try GPT-5.6 Luna now.
No subscription. Free credits to start. The chat opens with GPT-5.6 Luna selected and a prompt ready - just send.