Simon Willison
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1 week ago
Jarred Sumner rewrote the Bun runtime from Zig to Rust using AI agents to automate the port, addressing memory safety issues that caused use-after-free and double-free bugs in the original codebase. The rewrite consumed 5.9 billion input tokens and 690 million output tokens across 11 days of agent-assisted development, with costs estimated at $165,000 at standard API pricing. Startup performance on Linux improved 10 percent, and the new Rust version has been running in Claude Code since June 17th with minimal user-visible changes.
Simon Willison
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1 week ago
Kenton Varda banned his team from using AI to write change descriptions for pull requests and commits. The AI-generated descriptions included low-level code details visible in diffs while omitting the high-level context needed to understand the changes' purpose. As a result, Varda found the descriptions made code review harder rather than easier.
OpenAI Blog
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1 week ago
OpenAI's analysis identified flaws in SWE-Bench Pro, a widely-used benchmark for evaluating coding AI systems, questioning whether its results accurately reflect model performance. The benchmark contains ambiguous test cases and inconsistent evaluation criteria that affect reliability of the results. This finding prompts developers to scrutinize existing coding benchmarks more carefully and potentially revise evaluation methodologies before trusting benchmark rankings.
TLDR
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1 week ago
Herdr is a terminal-based agent multiplexer that displays multiple AI agents' status and output in real-time, allowing users to manage concurrent agent tasks without leaving the terminal. The tool is distributed as a single Rust binary at version 0.4.0 with support for macOS, Linux, and Windows, installable via curl or Homebrew. Sessions persist across detaches and restarts, enabling users to disconnect and reattach from any terminal or SSH connection while agents continue running.
The Neuron
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1 week ago
Anthropic launched a free access program for open-source maintainers and contributors, providing six months of complimentary Claude Max subscriptions. Eligible applicants include maintainers of packages with 500+ dependent repositories, core contributors to major projects like CPython and Kubernetes, active contributors with 100+ merged pull requests in the past year, and maintainers of critical infrastructure. After six months, paid subscriptions resume at their previous rate while others revert to free-tier access.
OpenAI Blog
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1 week ago
OpenAI Academy and the Walton Family Foundation are launching AI Skills Jams, which are hands-on training events designed to help K–12 educators learn practical applications of AI in classroom settings. The program will conduct multiple in-person and virtual sessions across different regions to reach educators. Teachers who complete the training will be equipped to integrate AI tools and concepts into their curriculum and instruction.
Hugging Face Blog
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1 week ago
The transformers library's backend for vLLM now achieves inference speeds matching or exceeding vLLM's hand-written implementations through dynamic layer fusion and runtime optimization. Tests across three Qwen3 models—a 4B dense model, a 32B dense model with tensor parallelism, and a 235B mixture-of-experts model—demonstrated parity with native vLLM throughput on all benchmarks. Model authors can now deploy transformers implementations directly to vLLM with the `--model-impl transformers` flag without sacrificing performance or writing custom inference code.
