GPT-6 Luna
Most efficient GPT-6 model for focused, high-volume tasks; successor to GPT-5.6 Luna (the mini/nano tier). OpenRouter also lists openai/gpt-6-luna-pro.
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Knowledge cutoff
- 2026-05
- Input
- text, image
- Output
- text
- License
- proprietary
- Pricing
- input: $0.1 · cached input: $0.01 · output: $0.5 · cache write: $0.125 (per 1M tokens (USD), standard tier) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| OpenAI API | gpt-6-luna | https://api.openai.com/v1/responses | docs |
| Azure OpenAI (Microsoft Foundry) | gpt-6-luna | — | docs |
| OpenRouter | openai/gpt-6-luna | openrouter.ai/openai/gpt-6-luna | — |
| Web app | — | chatgpt.com | — |
Notable capabilities (3)
- 1M context at $0.10/M: Cheapest OpenAI reasoning model with the full 1.05M context window and 128K output. source
- Agentic tools on the budget tier: Supports computer use, hosted shell, MCP and tool search like the larger models. source
- Free-tier ChatGPT model: Rolled out to ChatGPT free users and the desktop app at launch. source
High-volume classification, extraction, routing, sub-agents.
curl https://api.openai.com/v1/responses \
-H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
-d '{"model":"gpt-6-luna","input":"Hello"}'
Sources:
Other OpenAI models
GPT-6 Sol · GPT Image 2.5 Flare · GPT Image 2.5 Sunburst · GPT-6 Astra · GPT-Live-Transcribe · GPT-Transcribe · GPT-5.6 Terra · GPT-Live 1 · GPT-Realtime-2.1 · GPT-Realtime-2 · GPT-Realtime-Translate · GPT-Rosalind · GPT-Audio-1.5 (and gpt-audio / gpt-audio-mini) · GPT-5.3-Codex · gpt-oss-120b · gpt-oss-20b · GPT-4o mini TTS · text-embedding-3-large · text-embedding-3-small · GPT-5.6 Luna · GPT-5.6 Sol · GPT-Realtime-Whisper · GPT-5.5 Pro · GPT-5.5 · GPT Image 2 · GPT-5.4 · GPT-Realtime-1.5 · GPT-4.1 · GPT-4o · TTS-1 / TTS-1 HD · Whisper large-v3 / large-v3-turbo (open weights) · GPT-Realtime and GPT-Realtime mini · o3 · GPT-4o Transcribe / Mini Transcribe / Transcribe Diarize · Whisper (whisper-1 API) · Sora 2