GPT-6 Luna
GPT-6 Luna is the efficient GPT-6 tier for focused high-volume tasks. It supports text and image input, text output, and reasoning effort from none to max. Responses exposes its built-in tools and function calling; Chat Completions function calling requires none effort. The October Decisions API adds a typed-output interface using this same model identity.
2026-09-22
Unreleased
Undisclosed proprietary architecture
Proprietary
Specifications
- Parameters
- Unreleased
- Architecture
- Undisclosed proprietary architecture
- License
- Proprietary
- Context Window
- 1,050,000 tokens
- Max Output
- 128,000 tokens
- Training Data Cutoff
- May 18, 2026
- Type
- multimodal
- Modalities
- textimage
Benchmark Scores
Advanced Specifications
- Model Family
- GPT-6
- API Access
- Available
- Chat Interface
- Not Available
- Variants
- gpt-6-luna
Capabilities & Limitations
- Capabilities
- reasoningvisiontool usestructured outputs
- Known Limitations
- Can produce incorrect factual claims or code; important results require independent verification.Chat Completions function calling requires reasoning_effort none; use Responses for tools with reasoning.
- Notable Use Cases
- high-volume decisionsdata extractionfocused agents
- Function Calling Support
- Yes
- Tool Use Support
- Yes