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.

Cognition's FrontierCode 2.0, which tests real-world engineering judgment, tops out at 45.5% with Opus 5.5, followed by GPT-6 Astra at 42.8%.

On the new coding-agent benchmark Opus 5.5 leads at 45.5% and Astra follows at 42.8%; on one bug Astra passed 5/5 at low reasoning but only 1/5 at maximum, where it deleted a public API.

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.

Cognition's price-vs-performance evaluation puts Opus 5.5 and GPT-6 Astra top on intelligence at $12.8 and $6.67 per task, with GPT-6.1 Sol most cost-efficient and GPT-6 Luna cheapest overall.

On the same prompt, Astra cost $14.37 and took 40m18s, while GPT-6.1 Terra cost $2.14 and took 25m19s, with Sol in between.

The RWE-Bench leaderboard scores 11 frontier models on 20 real physical engineering tasks checked by physics solvers, with GPT-6 Astra leading at 37%.

Citing OpenAI, GPT-6.1 Terra reportedly matches GPT-6 Astra on agents' last exam at one-tenth the per-token price and over 3x the speed, prompting the question of why pay Astra prices.

A video overview of OpenAI's agent ecosystem, from GPT-6 Astra and Sol/Luna models through Agents SDK, Codex, voice APIs, memory and safety frameworks.

Terra matches GPT-6 Astra at 57.6% on Agents' Last Exam while costing $0.29 versus $4.82 per task, and scores 85.5% on MMMU-Pro against Astra's 86.7%.

Japanese outlet GIGAZINE reports on the new GPT-6.1 Terra model, calling it cost-effective and fast, with some benchmark results on par with GPT-6 Astra.

GPT-6.1 Terra targets computer use and everyday tasks, matching GPT-6 Astra on Agents' Last Exam at a tenth of the per-token price and finishing tasks over three times faster than Astra and Sol.