GPT-6 Astra in Practice: Tests, Use Cases, and Feedback

OpenAI says new Pro subscriptions put the most strain on its systems, so it paused them to preserve broad access, with no date given for reopening.

OpenAI has paused new sign-ups for its $200 Pro plan without saying when it will reopen, which the author attributes to surging Astra demand.

A post says OpenAI is preparing to pause ChatGPT Pro subscriptions because demand for GPT-6 Astra is too high, showing that even a well-resourced lab can hit inference capacity limits.

The post says OpenAI engineers gave GPT-6 Astra a slow test build of their own coding tool, which traced the problem to a memory bottleneck and swapped the allocator, making every turn 25x faster.

The workflow splits intake through filing across eight roles, with only one allowed to commit changes, relying on Astra's 1.05M-token context and 88% first-attempt success to contain failures.

The author opened a Pro plan to try SWE 2, built on Kimi K3, and says it matches full GPT-5.6 Sol performance without over-engineering, outperforming the currently degraded GPT-6 Astra.

The author reviewed OpenAI's GitHub and found capacity errors, context compaction problems, quota resets and a merged reasoning-effort fix, while noting none of it proves Astra itself was weakened.

thsottiaux joked that the name Astra could be spelled out as Amazon, Stripe, Tesla, Revolution and Oracle.

SWE-2 is post-trained on Kimi K3 and scores 50% on FrontierCode, beating Grok 4.6 and GPT-5.6 Sol but trailing Fable 5.1 and Astra, with costs up to 70% lower.

The author says GPT-6 Astra outperforms other frontier models on their antibody developability benchmark, and an interactive visualization of how antibodies work was built with it in about an hour.

A Codex configuration assigns models by task, with Astra used for low-effort steps like proposal, design, verification and review.

A breakdown of OpenAI's new Agents SDK design: each agent gets its own sandbox, keeps state and files across runs, gates tools with permissions and guardrails, and resumes the same job after a crash.