Simon Willison on anthropic
Anthropic occupies a peculiar position in the AI landscape: a company that genuinely believes it might be building one of the most transformative and potentially dangerous technologies in human history, …
Claude Opus 4.6 \ Anthropic
Nov 24, 2025 · Opus 4.6 is the best Anthropic model we’ve tested. It understands intent with minimal prompting and went above and beyond, exploring & creating details I didn't even know I wanted until …
Simon Willison’s Weblog - vuink.com
Nov 24, 2025 · I spent a bunch of time with it in Claude Code, resulting in a new alpha release of sqlite-utils that included several large-scale refactorings—Opus 4.5 was responsible for most of the work …
Simon Willison’s Weblog
Don’t “Trust the Process” (via) Jenny Wen, Design Lead at Anthropic (and previously Director of Design at Figma) gave a provocative keynote at Hatch Conference in Berlin last September.
Anthropic prices Claude Opus 4.5 at $5/1M input and $25/1M ...
Simon Willison / Simon Willison's Weblog: Anthropic prices Claude Opus 4.5 at $5/1M input and $25/1M output tokens, much cheaper than Opus 4.1 at $15/$75 but still pricier than GPT-5.1 and Gemini 3 …
Opus 4.6 and Codex 5.3 - simonwillison.net
3 days ago · The most convincing story about capabilities of the new model so far is Nicholas Carlini from Anthropic talking about Opus 4.6 and Building a C compiler with a team of parallel Claudes - …
Hidden AI instructions reveal how Anthropic controls Claude 4
May 27, 2025 · On Sunday, independent AI researcher Simon Willison published a detailed analysis of Anthropic’s newly released system prompts for Claude 4’s Opus 4 and Sonnet 4 models, offering …