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GPT-6 Luna

OpenAIProprietaryPending Human Review

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

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