OpenAI · llm model
GPT-5.6 Luna
GPT-5.6 Luna is an OpenAI language model released Jul 9, 2026; OpenAI's newest language model in our dataset is GPT-6.1 Terra. Proprietary, API access only. OpenAI's GPT-5.6 low-cost model for high-volume workloads, released Jul 9, 2026. Verified against vendor sources on Oct 26, 2026.
Reported Last verified · All models · JSON · Markdown
- ReleasedJul 9, 2026
- Context window1.05M1,050,000 tokens
- Max output128K128,000 tokens
- LicenceProprietaryProprietary (API)
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Key facts
| Fact | Value | Source |
|---|---|---|
| Vendor | OpenAI | n/a |
| Released | Jul 9, 2026 | source |
| Status | generally available | n/a |
| API id | gpt-5.6-luna | source |
| Context window | 1,050,000 tokens (1.05M) | source |
| Max output | 128,000 tokens | source |
| Input | text, image | source |
| Output | text | source |
| Licence | Proprietary (API) | source |
| Pricing | $0.2 in / $1.2 out per 1M tokens | source |
Where GPT-5.6 Luna sits in our data
- Released Jul 9, 2026 (week 28 of 2026), in July 2026. Other models in our data released that month: Gemini Robotics ER 2, GPT-Live-Transcribe, GPT-Transcribe, Claude Opus 5, Gemini 3.5 Flash-Lite, Gemini 3.6 Flash.
- The previous OpenAI model we track is GPT-Realtime-2.1 mini (Jul 6, 2026), 3 days earlier.
- Of the 60 models in our data with a published context window, GPT-5.6 Luna has the number 5 largest (1.05M tokens). Our data is not every model on the market.
- OpenAI tools we cover: Codex CLI, ChatGPT, OpenAI Agents SDK.
- All releases by date: AI model releases by month · new AI models this week. Choosing for code: best LLM for coding.
How GPT-5.6 Luna differs from GPT-5.6 Sol
Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.
- Listed price is $0.2 in and $1.2 out, against $4 in and $20 out for GPT-5.6 Sol (per 1M tokens).
- Both list a 1.05M-token context window.
- Both accept text, image as input.
- Both were released on Jul 9, 2026.
- Facts for the other model: GPT-5.6 Sol.
What we tested
Nothing yet. We have not run GPT-5.6 Luna ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.
Sources
More from OpenAI
- GPT-5.6 Sol (Jul 9, 2026)
- GPT-5.6 Terra (Jul 9, 2026)
- GPT-Realtime-2.1 (Jul 6, 2026)
- GPT-Realtime-2.1 mini (Jul 6, 2026)
- GPT-Live-Transcribe (Jul 28, 2026)
- GPT-Transcribe (Jul 28, 2026)
- GPT-6 Astra (Sep 3, 2026)