Saturday, April 18, 2026

11 articles

Simon Willison
1 min read

Changes in the system prompt between Claude Opus 4.6 and 4.7

Anthropic are the only major AI lab to publish the system prompts for their user-facing chat systems. Their system prompt archive now dates all the way back to Claude 3 in July 2024 and it's always interesting to see how the system prompt evolves as they publish new models. Opus 4.7 shipped the...

Simon Willison
1 min read

Claude system prompts as a git timeline

Research: Claude system prompts as a git timeline Anthropic publish the system prompts for Claude chat and make that page available as Markdown. I had Claude Code turn that page into separate files for each model and model family with fake git commit dates to enable browsing the changes via the...

TechCrunch
1 min read

AI chip startup Cerebras files for IPO

In recent months, the company announced an agreement with Amazon Web Services to use Cerebras chips in Amazon data centers, as well as a deal with OpenAI reportedly worth more than $10 billion.

TechCrunch
1 min read

Tesla brings its robotaxi service to Dallas and Houston

Tesla is expanding its robotaxi service to Dallas and Houston, according to a social media post from the company. The post says simply that “Robotaxi is now rolling out in Dallas & Houston 🤠” and includes a 14-second video showing Tesla vehicles driving without human monitors or drivers in the...

The Verge
1 min read

The RAM shortage could last years

According to Nikkei Asia, even as suppliers ramp up DRAM production, manufacturers are only expected to meet 60 percent of demand by the end of 2027. SK Group chairman has even said that shortages could last until 2030. The world's largest memory makers - Samsung, SK Hynix, and Micron - are all...

The Register
1 min read

Cloudflare can remember it for you wholesale

Agent Memory stores AI chat scraps off to the side and recalls them when needed Not only is hardware memory scarce these days, but context memory, the conversational data exchanged with AI models, can be an issue too.…

Simon Willison
1 min read

Adding a new content type to my blog-to-newsletter tool

Agentic Engineering Patterns > Here's an example of a deceptively short prompt that got a lot of work done in a single shot. First, some background. I send out a free Substack newsletter around once a week containing content copied-and-pasted from my blog. I'm effectively using Substack as a...