GPT-6 Astra
OpenAI · GPT Astra line · flagship
New linefirst release Sep 3, 2026 — no rhythm to measure yet
Released Sep 3, 2026 · what changed →Days since last release
Days since last release
GPT-6 Astra · Sep 3, 2026
24
days
The newest GPT Astra model is GPT-6 Astra, released on September 3, 2026. It is the first model in this line, so there is no release rhythm to measure yet.
Where the line stands
How long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
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Every GPT Astra release
Newest first — what each version changed versus the one before, in OpenAI's own numbers.
Sep
3
OpenAI's new flagship scores 6 points higher than GPT-5.6 Sol on the all-round intelligence index, makes up far fewer answers and uses a third of the tokens on coding-agent work — at 2.5 times the price.
Compared with GPT-5.6 Sol · OpenAI's previous top model
Invents facts on half as many trick questions
AA hallucination rate — how often it makes up an answer instead of admitting it doesn't know
51%
▲ down from 92% · 41 points fewer
Uses about a third of the tokens on coding-agent tasks
AA Coding Agent Index, max effort — text consumed per task
~⅓ tokens
▲ vs GPT-5.6 Sol · 70% more token-efficient
Costs 2.5 times more to run than Sol
Price per 1M tokens — what developers pay, input / output
$10 / $50
up from $4 / $20 · 2.5× the price