GPT-6 Astra: Why It's Better Than Fable 5.1 (Cost + Performance Breakdown)
OpenAI just dropped GPT-6 Astra on September 3, 2026, and it's already turning heads in the developer community. If you're building AI agents, automating workflows, or running local LLM stacks, here's why Astra matters—and why it might be the better choice over Anthropic's Claude Fable 5.1, especially when you factor in real-world cost and performance. What Is GPT-6 Astra? GPT-6 Astra is OpenAI's first "Critical"-rated model under its Preparedness Framework, meaning it meets the highest cybersecurity capability threshold with stronger safeguards for release. [cite:52][cite:57] It's designed to operate computers, browse the web, work across large file collections, write and execute code, and continue complex tasks with minimal human guidance. [cite:60] Key specs: Context window: 1,050,000 tokens Max output: 128,000 tokens Knowledge cutoff: April 30, 2026 Input modalities: Text and images Output: Text only (no audio or video) Reasoning...