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

A budget-constrained, iterative benchmark compares Claude Opus 5.5, GPT-6 Astra, DeepSeek V4.1 Flash 1017 and MiniMax M3.1 Flash on building a 75-second hypersonic wind-tunnel CFD simulation in a single offline HTML file.

A user notes that on a new benchmark Sonnet 5.5 sits close to Opus 5.5 and GPT-6 Astra while far ahead of Fable 5.1, calling Anthropic's Sonnet impressive.

A video challenge pits Claude Sonnet 5.5, Claude Opus 5.5 and GPT-6 Astra against each other to build the best horror game in Unreal Engine 5.8 using Aura AI.

Mollick asked Claude Fable and GPT-6 Astra, without looking anything up, when the Exponential Time Hypothesis will be solved, using the answers to show how hard forecasting is even for AI.

A user expects GPT-6.1 Luna to arrive before Tibo's 28-day challenge ends and hopes OpenAI saves GPT-6.1 Astra for the final day to beat Claude Opus 5.5.

A complaint post says Claude Opus 5.5 burns its 5-hour limit in 15–30 minutes, GPT-6 Astra exhausts a week's Codex quota in a day, and Gemini's weekly cap is just as tight.

As OpenAI ships 6.1 Terra, a user notes Sonnet 5.5 beats not only Terra but also 6.1 and GPT-6 Astra on some benchmarks.

A video comparing GPT-6 Astra against Claude Opus 5.5 side by side for people choosing between the two models.

On the same six-legged robot animation task, the author says Opus 5.5 produced a rounded shell, glowing sensor and more natural gait, while GPT-6 Astra built it from flat white boxes with a blank wall for a face.

After Anthropic banned his Claude Max account six times, the author tried Codex plus GPT-6 Astra for video editing, ended up with an unusable cut and deleted project files, and reflects on over-reliance on one model and model-driven skill gaps.

A short subjective take claiming Claude Opus 5.5 is the best model the author has used and clearly stronger than GPT-6 Astra, with no supporting detail.

The author cites the Oct 24 Artificial Analysis index, saying Claude Opus 5.5 and Sonnet 5.5 lead while Kimi K3.1 Pro also outranks GPT-6 Astra, making GPT-6.1 Terra critical.