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

On the same prompt Opus 5.5 wins on water physics while Astra adds detail like the rocket rollout and liftoff camera, at $37.96 versus Opus's $23.51 in API cost.

The author collected demos built with Opus 5.5, GPT-6 Astra and other models into a single page for inspiration or browsing.

The author claims GPT-6.1 Astra, meant as OpenAI's comeback, was quietly scrapped and replaced by 6.1 Sol, as if OpenAI took Amodei's 'slow down' talk seriously.

A shared prompt tells Codex/GPT-6 Astra to research the last five days of infosec news and then fix security issues on an SSH-connected server, noting Claude Code may be blocked by its classifier.

Given the same single-file HTML prompt, GPT-6 Astra finished fastest at 40 minutes for about $20.76, versus Kimi at 25 minutes for $3 and DeepSeek at 2 hours for $0.9.

A list of 10 GitHub repos plus a git bisect workflow for using GPT-6 Astra or Claude Code to trace regressions and verify patches.

Knowing nothing about embryos, the author used GPT-6 Astra to build a 3D Human Embryo Explorer for the Virtual Embryo Challenge that can be spun and pulled apart.

The author built several sites with Codex and GPT-6 Astra, finding visuals and hand-drawn logos stronger but translation skipping passages and coding detail still behind Claude Opus 5.5.

Citing Artificial Analysis, the author compares Opus 5.5 (61.7, $11.42), GPT-6 Astra (54.7, $7.04) and GPT-6.1 Sol (54.1, $1.50), splitting parallel chores to Sol and key work to Opus 5.5.

A complaint post notes it has been almost two months since GPT-6 Astra with no new frontier model, despite Sam Altman saying more were ready to ship.

Running the Lighthouse test at max, the author spent $23.42 on Kimi K3.1 Pro yet it lost to Opus at $53 and GPT-6 Astra at $42, questioning the value claim.

A day-by-day Codex changelog covering ~50% faster Astra defaults, GPT-6 in ChatGPT, 6.1 Sol ultrafast and 500k context, plus 9 usage resets in 19 days.