GPT-6-Astra Can Do Ambitious Things

Substack · Watch/Read · (gathered 2026-09-13)

• GPT-6 Astra marks a “step-function change” in AI capabilities, excelling at “ambitious projects,” 3D tasks, computer use, and subagent coordination, making the AGI debate “non-silly” for the first time.
• Astra demonstrates unprecedented performance in areas like autonomously completing Portal, reaching Minecraft’s Nether Fortress, advancing mathematical proofs (e.g., Seymour Conjecture), and creating complex 3D environments in Unreal Engine and Blender.
• Its “Thinking, Fast Without Slow” capabilities, showing remarkable performance even with Chain-of-Thought (CoT) disabled, suggest significant architectural changes and raise concerns about monitoring its internal cognition and alignment.
• For difficult questions and ambitious projects, the recommended strategy is “dual wielding” – using both Astra and Fable 5.1, as they offer complementary strengths, with Astra often preferred for large-scale, complex tasks.
• OpenAI’s launch was criticized for a frustrating “paced rollout” and “chart crime” through unnecessary overstatement and potentially contaminated benchmarks, despite Astra’s genuinely impressive scores.