Has OpenAI released GPT-6 Luna?
No. As of September 15, 2026, OpenAI had not announced GPT-6 Luna; its public directory lists GPT-5.6 Luna and GPT-6 Astra, and the GPT-6 Luna documentation URL returns 404.
GP
GPT-6 Luna
RumoredReasoning modelAlso known as: GPT 6 Luna / OpenAI GPT-6 Luna
Release date: 2026-09-15Views: 23
Parameters
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Context length
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Multilingual
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Reasoning ability
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GPT-6 Luna is a rumored OpenAI model name. On September 15, 2026, Sam Altman teased a major launch this week on X, and observers expect GPT-6 to follow GPT-5.6's Sol / Terra / Luna tiers. OpenAI has not announced GPT-6 Luna, an API identifier, specifications, pricing, a release date, or benchmark results.
Data sourced primarily from official releases (GitHub, Hugging Face, papers), then benchmark leaderboards, then third-party evaluators. Learn about our data methodology
GPT-6 Luna
Model basics
Reasoning traces
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Thinking modes
Thinking modes not supported
Context length
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Max output length
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Model type
Reasoning model
Modality (in / out)
No data
Release date
2026-09-15
Model file size
No data
MoE architecture
No
Total params / Active params
No data / Not applicable
Knowledge cutoff
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GPT-6 Luna
Open source & experience
Code license
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Weights license
No data
GitHub repo
N/A
Hugging Face
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Live demo
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GPT-6 Luna
Official resources
Paper
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DataLearnerAI blog
N/A
GPT-6 Luna
API details
API speed
No data
No public API pricing yet.
GPT-6 Luna
Publisher
OpenAI
View publisher details GPT-6 Luna
Model Overview
Rumored and unconfirmed
GPT-6 Luna is not an OpenAI-confirmed product name. On September 15, 2026, Sam Altman teased a major launch for this week on X. Because OpenAI shipped GPT-5.6 as three tiers named Sol, Terra, and Luna, observers expect GPT-6 to arrive as GPT-6 Sol, GPT-6 Terra, and GPT-6 Luna. That expectation rests on the naming pattern, not on an OpenAI announcement.
Expected positioning
In the GPT-5.6 family, GPT-5.6 Luna is the fast, low-cost tier. If GPT-6 keeps the same scheme, GPT-6 Luna may take a similar role, but OpenAI has published nothing about it. This record does not copy GPT-5.6 Luna's context window, reasoning settings, pricing, or benchmark results.
Not GPT-5.6 Luna or GPT-6 Astra
As of September 15, 2026, OpenAI's public model directory lists GPT-5.6 Luna and the released GPT-6 Astra, but not GPT-6 Luna.
Unknown fields
Parameter count, architecture, context window, output limit, modalities, tools, reasoning modes, knowledge cutoff, API ID, availability, price, licence, and benchmark results are unpublished and remain empty. The displayed date is when this rumor was recorded, not a release date or prediction.
Sources
- OpenAI API model directory: checked on September 15, 2026.
- GPT-6 Luna documentation URL: returned 404 on September 15, 2026.
- GPT-5.6 announcement: source of the Sol / Terra / Luna naming.
GPT-6 Luna
FAQ
Why is GPT-6 Luna expected?
OpenAI named the GPT-5.6 tiers Sol, Terra, and Luna, and Sam Altman teased a major launch for the week of September 15, 2026. Together these suggest GPT-6 tiers with the same names, but that is an inference.
What specifications or price are known for GPT-6 Luna?
None. Parameters, context, modalities, API access, pricing, and benchmarks remain empty rather than being extrapolated from GPT-5.6 Luna or GPT-6 Astra.
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