OpenAI launched GPT-6 Astra on September 3, 2026, rolling out first to a limited set of organizations and over subsequent days to ChatGPT Plus/Pro/Business/Enterprise, the API, and AWS. It is priced at $10/$50 per million input/output tokens, matching Claude Fable 5 and 5.1. OpenAI describes it as its 'most intelligent and aligned model yet,' positioned around computer/browser use, coding, math/science, office work, and cybersecurity, per OpenAI and TechCrunch. OpenAI and testers reported a 99.9% score on ARC-AGI-3 using a custom 'Provider Adapter harness' costing $19K, versus 62.7% for $26K on the standard harness, per ARC-AGI's own blog as relayed by Simon Willison. Independent measurement firm Artificial Analysis found Astra's Intelligence Index score of 61 β level with GPT-5.6 Sol, five points below Claude Fable 5.1, and behind Meta's Muse Spark 1.3 β while leading on their Coding Agent Index cost-efficiency measure (2 points higher than Sol at equal max-effort cost, and less than half Fable 5's per-task cost at equal score). On security benchmarks OpenAI reported Astra scoring 100% on ExploitBench (vs. Sol's 78.5%), 42.4% on ExploitGym (vs. 30.3%), and 99.2% on SRE-Bench (vs. 68.7%), and 100%/96.3% on OpenAI's own long-context needle benchmark at 256K-512K/512K-1M tokens. OpenAI's system card described both improved alignment and decreased chain-of-thought monitorability, drawing pointed reaction from researchers including Neel Nanda and Ryan Greenblatt, per Latent Space's recap. The rollout itself was bumpy: TechCrunch and Latent Space reported delays, a broken/late blog post, unclear access timing, and user frustration that many influencers had early access while paying customers did not; OpenAI compensated affected paid users with 'banked resets.'
2026-09-03 Release Benchmark result Safety / alignment Lab strategy GPT-6 Astra