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GPT-5.6 Luna
AvailableOpenAIProprietary
Fast, low-cost tier of OpenAI's GPT-5.6 series, officially previewed June 26, 2026 — the most affordable model in the family, bringing strong capability at OpenAI's lowest cost. Shares the series' capability-tier naming and GPT-5.6 safety stack. Begins as a limited preview via the API and Codex for vetted partners after U.S. government review, with broader availability planned in the following weeks. Priced at $1 / $6 per million input/output tokens.
Specifications
- License
- Proprietary
- Weights
- Not released
- Architecture
- unknown
- Parameters
- Undisclosed
- Context window
- 1.5M tokens
- Max output
- 128K tokens
- Knowledge cutoff
- Jan 31, 2026
- Price (in / out, $/M)
- $1 / $6
- Modalities
- TextVisionAudioCode
Benchmarks
No benchmark scores recorded yet. Spotted some? Submit a correction.
Vendor-reported figures are claims until independently verified. See methodology.