AI Chat

Perplexity published its internal manual for building agent skills and paired it with a research post about how those skills power products like Computer. The guide matters because it gives external builders concrete patterns for decomposing agent behavior into reusable skill folders instead of one-off prompts.

OpenAI is rolling GPT-5.5 Instant into ChatGPT as the default model and exposing it as gpt-5.5-chat-latest, alongside Memory Sources for personalized replies. The model also claims 52.5% fewer high-stakes hallucinations, so watch for behavior changes in production prompts.

Perplexity launched Professional Finance for Computer with licensed Morningstar, PitchBook, Daloopa, and Carbon Arc data plus 35 analyst workflows. The release matters because outputs are now designed to stay traceable to source documents instead of behaving like opaque chat answers.

OpenAI added an opt-in security mode for ChatGPT and Codex that disables password-based recovery, shortens sessions, and requires passkeys or physical keys. Higher-risk accounts get stronger phishing resistance and automatic exclusion from model training when the mode is enabled.

OpenAI shipped a Google Sheets add-on that lets ChatGPT build, edit, analyze, and update spreadsheets with natural-language prompts. The integration gives teams a lightweight way to automate sheet workflows without moving data into a separate BI or scripting stack.

OpenAI introduced a free ChatGPT tier for verified U.S. clinicians and released HealthBench Professional, an open benchmark built from real clinical chat tasks. The launch pairs a clinician-facing workflow product with a public evaluation set and published model results.

Multiple Pro users said GPT-5.4 Pro started producing richer front-end and SVG outputs with much faster runtimes, despite no formal OpenAI announcement. The reports matter because they affect whether long visual and code-generation tasks are practical inside ChatGPT.

Perplexity launched Personal Computer for Mac, giving its desktop agent access to local folders, native apps, and the browser from one orchestration layer. It also supports Mac mini setups controlled from iPhone, pushing the product toward an always-on desktop agent.