Released 56 days after GPT-5.6 Luna · All OpenAI releases
GPT-6 Astra is OpenAI's most capable model, released as a limited preview to a small set of organizations on September 3, 2026 with a phased rollout to paying customers and the API starting the following day, succeeding GPT-5.6 Sol as the flagship. It works across a 1.05 million token context with up to 128K output tokens, carries a knowledge cutoff of April 30, 2026, and supports reasoning, image input, tool calling, and structured output. OpenAI positions it as a generational step for computer use, browsing, software engineering, cybersecurity, and science, and reports state-of-the-art results on Agents' Last Exam, AutomationBench, ScreenSpot Pro, Terminal-Bench 4.0, Terminal-Bench Science 0.1, and HealthBench Pro. OpenAI's own figures put it at 98% on FrontierMath Tier 4 and 99.9% on ARC-AGI-3, which it describes as saturating both. In Codex it adds note keeping across context windows so long sessions no longer depend on repeated compression of earlier work. Astra is the tier for end-to-end work: complex multi-step reasoning, agents that drive a computer or browser through long tasks, and research or document creation that spans large inputs. It is the first OpenAI model classified at the company's critical cybersecurity threshold, so its most advanced security capabilities are gated behind an application-based program and the general release refuses some advanced cybersecurity requests.
Call GPT-6 Astra on Opper with the OpenAI SDK. Sign up without a credit card. Get started
GPT-6 Astra runs on 3 different routes through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below. Zero data retention on Azure is available on Enterprise.
GPT-6 Astra runs on 2 independently monitored routes through the Opper gateway. A direct integration leaves you on one of them, the gateway serves whichever is healthy.
Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.
Each route hosting GPT-6 Astra has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention: nothing is logged, held for abuse monitoring or used for training. Available under a signed Enterprise agreement. No training on customer data. GLOBAL; SCCs; DPA available.
Zero data retention with abuse monitoring: nothing is logged or used for training; content flagged by abuse monitoring is held for review. No training on customer data. GLOBAL; SCCs; DPA available.
Zero data retention with abuse monitoring: prompts and outputs are kept for up to 30 days for abuse monitoring only, and are not used for training. No training on customer data. US; SCCs; DPA available.
Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.
Call GPT-6 Astra through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.
GPT-6 Astra is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.
Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.ai/v3/compat",});const completion = await client.chat.completions.create({model: "gpt-6-astra",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
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