AI News for April 18, 2026 — 7min.ai

[NEWS] White House chief of staff meets Amodei as US seeks Mythos access: Susie Wiles met Anthropic CEO Dario Amodei at the White House this week as the administration pressed for priority access to Mythos, the frontier system at the center of Anthropic's cybersecurity disclosures.
[NEWS] Anthropic ships Claude Design with brand guardrails inside Cowork workspace: Anthropic released Claude Design inside the Claude Cowork workspace, turning natural-language prompts and screenshots into UI, brand systems, and marketing assets.
[NEWS] Cursor in talks to raise $2B at $50B valuation, targets $6B ARR: Cursor's parent Anysphere is negotiating a $2B+ round at a $50B valuation, more than doubling its mark from six months ago.
[NEWS] Cerebras files publicly for US IPO: Cerebras Systems filed publicly for a US listing, reviving its IPO push after the 2024 Cfius review that stalled its original attempt.
[NEWS] UK gets Mythos access within a week as £500M sovereign AI fund backs Callosum: Anthropic committed to giving the UK government access to its Mythos capabilities within a week, the same window being negotiated with the US.
[NEWS] ChatGPT market share drops to 56.72% as Claude nearly triples: ChatGPT's share of consumer chatbot traffic fell to 56.72% in March, down from 71% a year ago, according to Similarweb web-visit data.
[RESEARCH] Vidoc reproduces Anthropic's Mythos findings with public GPT-5.4 and Opus 4.6: Security research firm Vidoc published a replication of Anthropic's Mythos cybersecurity disclosures using only commercially available models.
[NEWS] OpenAI shareholders reportedly question Altman's IPO leadership; Bret Taylor floated: Some OpenAI shareholders have begun privately questioning whether Sam Altman is the right CEO to take the company public, citing volatile messaging on capex and an increasingly combative public posture.
[NEWS] OpenAI loses three top executives as company sheds side projects: Kevin Weil, Bill Peebles and product leader Srinivas Narayanan are all exiting OpenAI, the third wave of senior departures in six months.
[NEWS] Beijing brands Meta's $2B Manus acquisition 'conspiratorial,' bars founders from leaving: Chinese regulators publicly labeled Meta's $2B acquisition of Manus a conspiracy and imposed exit bans on the founders while an investigation proceeds.

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