A source-based review of the October 2026 ChatGPT updates, covering Slides, GPT-6, voice models, audio uploads, Codex predictions, and availability by plan.
GPT-6.1 Sol costs significantly less than GPT-6 Astra, but developers should estimate the cost of their specific workload before choosing between them.
This source-based guide explains Coding sessions are longer and use more context. Claude Opus 5.5 is built with that in mind., what the official first-party material supports, and what readers should verify before relying on it.
Anthropic’s latest Opus model is designed for difficult coding tasks, sustained reasoning, higher-resolution vision, stronger output verification, and new cybersecurity safeguards.