OpenAI · llm model

GPT-6 Astra

GPT-6 Astra is an OpenAI language model released Sep 3, 2026; OpenAI's newest language model in our dataset is GPT-6.1 Terra. Proprietary, API access only. OpenAI's flagship GPT-6 model for complex reasoning and coding, and its most expensive text model per token. Verified against vendor sources on Oct 26, 2026.

Reported Last verified Oct 26, 2026 · All models · JSON · Markdown

ReleasedSep 3, 2026
Context window1.05M1,050,000 tokens
Max output128K128,000 tokens
LicenceProprietaryProprietary (API)

InTextImageOutText

Key facts

GPT-6 Astra: key facts with sources
Fact	Value	Source
Vendor	OpenAI	n/a
Released	Sep 3, 2026 Announced Sep 3, 2026 as a limited rollout to a set of organizations; OpenAI's announcement says "rolling out today to a limited set of organizations".	source
Status	generally available	n/a
API id	gpt-6-astra	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	$10 in / $50 out per 1M tokens Prompts above 272K input tokens cost 2x input and 1.5x output.	source

Where GPT-6 Astra sits in our data

Released Sep 3, 2026 (week 36 of 2026), in September 2026. Other models in our data released that month: GPT-6.1 Sol, Claude Sonnet 5.5, Claude Opus 5.5, Gemini 3.8 Flash TTS, Gemini 3.8 Flash-Lite TTS, GPT-6 Luna.
The previous OpenAI model we track is GPT-Transcribe (Jul 28, 2026), 37 days earlier.
Of the 60 models in our data with a published context window, GPT-6 Astra has the number 4 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-6 Astra differs from GPT-6 Luna

Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.

Listed price is $10 in and $50 out, against $0.1 in and $0.5 out for GPT-6 Luna (per 1M tokens).
Both list a 1.05M-token context window.
Both accept text, image as input.
GPT-6 Astra came out 19 days before GPT-6 Luna.
Facts for the other model: GPT-6 Luna.

What the sources say

These are claims from the linked pages, not our measurements.

OpenAI's models page calls it the "flagship for complex reasoning and coding".

Notes

Knowledge cutoff listed by OpenAI: Apr 30, 2026.

What we tested

Nothing yet. We have not run GPT-6 Astra 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.