Notes on the xAI/Anthropic data center deal
Anthropic, facing severe compute constraints, has leased the entire capacity of xAI's controversial Colossus 1 data center, highlighting the difficult trade-offs between compute needs, environmental concerns, and business interests in the AI industry.
Simon Willison · May 8, 2026
A pelican for GPT-5.5 via the semi-official Codex backdoor API
Although OpenAI's latest model GPT-5.5 hasn't officially launched its API, developers are already accessing it through a 'semi-official backdoor' in its Codex CLI using their ChatGPT subscription, revealing new dynamics in the battle over AI model distribution channels.
Simon Willison · Apr 24, 2026
Anthropic confidentially submits draft S-1 to the SEC
Anthropic's confidential IPO filing signals the AI industry's shift from venture-funded labs to publicly traded giants, reshaping the competitive landscape.
Anthropic News ·
May 6, 2026AnnouncementsHigher usage limits for Claude and a compute deal with SpaceX
Anthropic has significantly increased Claude's usage limits through massive compute deals with SpaceX and others, signaling that the AI infrastructure race has extended from the ground to space.
Anthropic News ·
Meta's new model is Muse Spark, and meta.ai chat has some interesting tools
Meta released Muse Spark, but the real story is its chat interface integrating 16 tools—web search, social media content search, code interpreter, etc.—building a complete AI agent workbench.
Simon Willison ·