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Frontier flagship models

GPT-6 Astra

OpenAI

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Published benchmark scores: Artificial Analysis Intelligence Index v4.3.253 — 7th of 216 models
combined score across ten reasoning and knowledge tests · tested: max reasoning
Artificial Analysis · 28 September 2026 · independent
Measured at 63.6 tokens per second output speed.
Figures copied from the sources above, checked 17 September 2026.
Cost: API $10 in / $50 out per million tokens; included for ChatGPT Plus, Pro, Business and Enterprise users.
Performance: OpenAI's flagship model for complex reasoning, coding and computer use. Its launch announcement reports state-of-the-art scores on several benchmarks; those are the maker's own figures, so check them against an independent leaderboard before relying on a specific claim.
Use it for: Demanding reasoning or research work
Agentic computer-use tasks
Complex coding through ChatGPT paid plans
Keep in mind: API use is priced per token and adds up fast; the free ChatGPT plan does not include Astra.