ChatGPT 5.1 vs Gemini 2.5: What Changed Today (Nov 12, 2025) — And Which AI Should You Use Now
OpenAI launched ChatGPT 5.1 with two models, Instant and Thinking, offering improved conversation and adaptive reasoning, now rolling out to paid users and API access later this week. Google upgraded Gemini Live voice mode on Android and iOS, enabling more expressive speech powered by Gemini 2.5 audio. Deutsche Telekom deployed a Gemini 2.5–based network agent. GPT-5 remains available as a legacy model for three months.