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GPT-6 Astra is OpenAI's GPT-6 flagship, released September 3, 2026 - 57.9% on Terminal-Bench 4.0 against GPT-5.6 Sol's 37.3%, and 96.3% long-context recall between 512K and 1M tokens. The strongest OpenAI model here, and the slowest and heaviest to run.
ChatGPT 6 Astra at a glance
Provider
OpenAI
Access on AskAI.free
Premium model; the 7-day Pro trial unlocks access.
Best first test
Problems where GPT-5.6 Sol runs out of depth - 97.6% on FrontierMath Tier 4 against Sol's 83.0%
Model position
New model in the OpenAI family.
What makes ChatGPT 6 Astra different
Astra sits above the whole GPT-5.6 family and the cheaper GPT-6 Sol and Luna tiers. Reach for it when the input is enormous or the chain of reasoning is long: its lead over GPT-5.6 Sol is widest on long-context recall and terminal work, and narrow on short knowledge questions. It carries the heaviest allowance weight on AskAI.free, so routine rewrites and quick lookups belong on a lighter model.
What ChatGPT 6 Astra is best for
Problems where GPT-5.6 Sol runs out of depth - 97.6% on FrontierMath Tier 4 against Sol's 83.0%
Very long inputs: 96.3% recall on MRCR v2 at 512K-1M tokens, where Sol drops to 73.8%
Terminal and agentic coding tasks (57.9% on Terminal-Bench 4.0 vs Sol's 37.3%)
Answers where accuracy matters - OpenAI measured a 4.2% hallucination rate against Sol's 12.2%
Reading screenshots and interfaces closely (92.7% on ScreenSpot-Pro)
How to use ChatGPT 6 Astra
Step 1
Save Astra for the work that justifies it. Each reply draws more of your allowance than any other model here, so draft with GPT-6 Sol and bring the hardest part to Astra.
Step 2
Paste the full material rather than excerpts. Astra keeps 96.3% recall even between 512K and 1M tokens, so a complete contract, codebase or research pack is where it pulls clearly ahead of the 5.6 family.
Step 3
Expect a considered answer, not an instant one. Astra reasons before it replies; for quick back-and-forth, GPT-5.6 Luna is the better fit.
Example prompts
Unlimited ChatGPT 6 Astra, free for 7 days
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Astra is OpenAI's GPT-6 flagship, released on September 3, 2026. OpenAI still calls it its best model across the board, above the cheaper GPT-6 Sol and GPT-6 Luna tiers that followed on September 22. In the ChatGPT app it appears as GPT-6 Pro on the Pro, Business and Enterprise plans.
How much better is Astra than GPT-5.6 Sol?
The gap is widest on agentic and long-context work: 57.9% vs 37.3% on Terminal-Bench 4.0, and 96.3% vs 73.8% recall at 512K-1M tokens. On knowledge tests it is close - 96.0% vs 94.6% on GPQA Diamond. OpenAI published these at maximum reasoning effort.
Where does Astra fall short?
By OpenAI's own chart it trails Claude on Humanity's Last Exam with tools, 57.2% against Claude Opus 5's 63.6%. Artificial Analysis measured about 58 tokens per second, slower than average. It is also the most expensive OpenAI model on the site, so each reply uses more of your token allowance than any other model here.
What security questions will Astra not answer?
Astra is the first model OpenAI rates Critical for cybersecurity capability, so it ships with OpenAI's strictest safeguards. Classifiers watch its reasoning and stop requests that look like offensive work, such as writing proof-of-concept exploits. Explaining vulnerabilities and reviewing your own code stay within scope.
Astra, GPT-6 Sol or GPT-6 Luna?
Astra when the task is long, hard or costly to get wrong. GPT-6 Sol covers most difficult work on a quarter of Astra's allowance weight, and GPT-6 Luna suits quick, repeated tasks. On short questions the extra depth rarely shows, so start lower and switch up when an answer falls short.
How current is Astra's knowledge?
Its training data runs to April 30, 2026. For anything newer, ask a Perplexity search model first and bring the sources back to Astra to analyse.
Can I use Astra on a free account?
No. Astra needs a Pro plan. The 7-day free trial gives you full access to it for the first week at no cost; cancel before day eight and you pay nothing.
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