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Simon Willison's Weblog
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Latest posts
Last updated about 4 hours ago
Quoting Catherine Wu
about 4 hours ago
While Sonnet 4.5 remains the default [in Claude Code], Haiku 4.5 now...
Introducing Claude Haiku 4.5
about 5 hours ago
Introducing Claude Haiku 4.5 Anthropic released Claude Haiku 4.5 today, the cheapest...
Quoting Claude Haiku 4.5 System Card
about 5 hours ago
Previous system cards have reported results on an expanded version of our...
A modern approach to preventing CSRF in Go
about 20 hours ago
A modern approach to preventing CSRF in Go Alex Edwards writes about...
NVIDIA DGX Spark: great hardware, early days for the ecosystem
1 day ago
NVIDIA sent me a preview unit of their new DGX Spark desktop...
Just Talk To It - the no-bs Way of Agentic Engineering
1 day ago
Just Talk To It - the no-bs Way of Agentic Engineering Peter...
nanochat
2 days ago
nanochat Really interesting new project from Andrej Karpathy, described at length in...
Quoting Slashdot
3 days ago
Slashdot: What's the reason OneDrive tells users this setting can only be...
Claude Code sub-agents
4 days ago
Claude Code includes the ability to run sub-agents, where a separate agent...
Vibing a Non-Trivial Ghostty Feature
4 days ago
Vibing a Non-Trivial Ghostty Feature Mitchell Hashimoto provides a comprehensive answer to...
Note on 11th October 2025
5 days ago
I'm beginning to suspect that a key skill in working effectively with...
An MVCC-like columnar table on S3 with constant-time deletes
5 days ago
An MVCC-like columnar table on S3 with constant-time deletes s3's support for...