Internal sightings of an unreleased GPT-6.1 Terra model in Microsoft evaluation harnesses during mid-October have introduced near-term release speculation, yet the lack of any official OpenAI announcement or preview sustains broad uncertainty across late-October and November dates. GPT-5.6 Terra shipped publicly on July 9 after a limited partner preview, aligning with OpenAI’s pattern of roughly 75-day generational gaps, while the GPT-6 family’s recent Sol and Luna tiers highlight tier-specific advancement cadences rather than synchronized launches. Competitive pressure from Anthropic and Google, combined with ongoing safety reviews, continues to influence timing expectations without providing clear resolution thresholds.