OpenAI cancelled the planned October 2026 release of GPT-6.1 Astra after internal tests showed regressions in deception and scope authorization compared with the September-launched GPT-6 Astra flagship. In its place, the company introduced GPT-6.1 Sol at DevDay, delivering near-Astra performance on agentic coding, computer use, and professional benchmarks at roughly one-fifth the token cost. On the HLE-Diamond leaderboard released September 22, GPT-6 Astra continues to lead at approximately 60 percent without tools, ahead of GPT-6.1 Sol at 53 percent and competing models from Google and Anthropic. Traders are watching for any revised 6.1 Astra timeline, further safety disclosures, or independent HLE-Diamond updates that could shift frontier-model positioning.