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Simon Willison's Weblog·23 Apr 2026
Use this view to inspect the underlying evidence corpus. For ranked developments, decision posture and interpretation, use Signals.
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Raw feed is chronological evidence. Signals ranks and interprets material change.
LiteParse, an open-source tool for PDF text extraction, now runs entirely in the browser using standard PDF parsing and OCR, without AI models.
Google's Threat Intelligence notes indirect prompt injection (IPI) is a top security priority, but actual exploitation in the wild remains limited.
The 'One Useful Thing' newsletter speculates on a hypothetical GPT-5.5 model, suggesting incremental advancements in capability.
OpenAI's GPT-5.5 model is rolling out via ChatGPT and a semi-official Codex backdoor API, with the primary API release delayed for safeguards.
AWS and IBM released a reference architecture combining agentic AI and serverless workflows to automate real-time KYC validation.
The UK National Cyber Security Centre (NCSC) released guidance on the careful oversight and new capabilities needed for AI adoption in cyber defence.
The UK National Cyber Security Centre (NCSC) details a widespread shift to covert, China-nexus compromised device networks for cyberattacks and defense strategies.
International cyber agencies, including the NCSC, issued new guidance on defending against China-linked covert network tactics in cyber activity.
OpenAI announced GPT-5.5, claiming it is their smartest, fastest model, designed for complex tasks including coding, research, and data analysis.
OpenAI published a 'System Card' for GPT-5.5, a speculative future model, detailing anticipated safety and alignment considerations.
Standard Chartered and Ant International are partnering to develop AI-driven solutions for corporate treasury and foreign exchange management.
Expert commentary deep dives into advanced AI research covering agent reasoning, multimodal generation, and humanoid learning techniques.
OpenAI launched a bug bounty program for GPT-5.5 Bio, challenging red teamers to find universal jailbreaks for biosafety risks, offering up to $25k.
Shopify CTO details aggressive AI integration, projecting 2026 usage explosion, leveraging Anthropic Opus 4.6 with unlimited tokens.
OpenAI offers ChatGPT for Clinicians at no cost to verified U.S. physicians, nurse practitioners, and pharmacists for clinical, documentation, and research use.
Nordea launched an AI-powered feature that generates personalized investment updates and portfolio commentary for retail clients.
Google DeepMind introduced Decoupled DiLoCo, a new method for distributed AI training designed to improve resiliency and efficiency in large-scale model development.
OpenAI detailed using WebSockets and caching to optimize API response times for agentic workflows, specifically for its Codex agent loop.
Anthropic briefly updated and then reverted its Claude.com pricing page, suggesting a move of 'Claude Code' from the $20/month Pro plan to higher tiers.
OpenAI reportedly launched GPT-Image-2. Cursor secured a $10B contract with xAI, with a $60B acquisition right, as per Latent Space.
Citi Wealth has announced 'Citi Sky', an AI-powered member platform built in collaboration with Google Cloud and DeepMind technologies.
OpenAI introduced an open-weight model, OpenAI Privacy Filter, for PII detection and redaction in text with high accuracy.
OpenAI launched ChatGPT Images 2.0, with Sam Altman claiming a performance leap from 1.0 equivalent to GPT-3 to GPT-5. User testing showed improved object recognition and scene composition.
Google DeepMind is collaborating with global consulting firms to expand the deployment of its frontier AI models across various organizations.
Hugging Face launched QIMMA, a quality-first leaderboard for Arabic Large Language Models, evaluating various models on multiple Arabic NLP tasks.
Hugging Face blog post discusses using synthetic personas to ground Korean AI agents in real demographics, improving cultural relevance.
Hugging Face blog post advocates for open-source AI models as a superior approach to cybersecurity compared to proprietary models.
OpenAI launched Codex Labs with Accenture, PwC, Infosys, and other partners to scale Codex enterprise deployment, reaching 4M weekly active users.
Microsoft, ANZ, HSBC, and Lloyds completed a collaborative proof of concept using AI to automate paper-heavy trade finance processes.
Block released benchmrk, an open-source evaluation harness for measuring the efficacy of Static Application Security Testing scanners.