Xiaohongshu (Red / REDnote)

OpenAI Hires Fields Medalist Jacob Tsimerman

Hours after winning the 2026 Fields Medal for work on the André‑Oort conjecture, mathematician Jacob Tsimerman announced he will join OpenAI's safety team. Tsimerman, a University of Toronto mathematician who has warned about AI extinction scenarios and predicted models could surpass human mathematicians at theorem proving, was publicly amplified by OpenAI researchers after the hire. The newsletter also reports several AI industry developments: Xiaohongshu open‑sourced BigMac, a multimodal training system that improved training speed on certain workloads; Moonshot released the 2.8 trillion‑parameter Kimi K3 model, whose API reportedly shut under demand; and Google said Gemini passed 950 million monthly users. The piece is a multi‑item AI newsletter published on 2026‑07‑24.

Why Xiaohongshu xsec_token Links Expire

This technical guide explains why Xiaohongshu (RedNote) public note links include short-lived xsec_token query parameters and provides practical recovery workflows. It advises treating the complete shared URL (including xsec_token and xsec_source) as a transient request input, validating URLs locally with a URL helper before API calls, and recovering expired tokens by re-copying current public addresses. The article describes a bookmarklet for batch-collecting up to 10 deduplicated note URLs, differentiates token expiry from temporary upstream timeouts, and recommends keeping RapidAPI credentials on the server. It also notes that XHS Data API is an independent provider and points readers to an xsec_token guide and free monthly testing allowance.

Asynchronously Process Larger Xiaohongshu Note Batches

This technical tutorial demonstrates how to process larger batches of public Xiaohongshu (RedNote) note URLs using an asynchronous workflow via the XHS Data API hosted on RapidAPI. It provides Python examples to submit an async job, poll for results at the recommended interval, and handle job lifecycle details (status transitions, per-item success preservation, sequential processing, restart resilience, and 24-hour expiry). The guide warns not to expose job_id as an authorization mechanism and recommends keeping RapidAPI keys server-side. Developer clients and retry helpers are available on the service’s developer site and a public GitHub examples repository. The XHS Data API states it is independent and not affiliated with Xiaohongshu/RedNote.