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GPT-6 Astra

OpenAI · GPT Astra line · flagship

Released September 4, 2026Latest in the line

GPT-6 Astra was released by OpenAI on September 4, 2026, as a flagship model in the GPT Astra line.

  • Release 1 of 1 in the GPT Astra line.
  • The first release in this line.
  • Still the newest model in the line.

What changed

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

Sources: OpenAI · Artificial Analysis · Artificial Analysis (model page)

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Where the GPT Astra line stands

GPT-6 Astra is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

Every GPT Astra release

Newest first. See the full line with every card →

  1. Sep 4, 2026GPT-6 Astra · this page