On June 12, 2026, Anthropic received a US government export control directive ordering the suspension of all access to its Fable 5 and Mythos 5 models for foreign nationals, forcing the company to disable both models for all customers. The directive cites a jailbreak method that can identify minor software vulnerabilities in a specific codebase, but Anthropic states that similar capabilities exist in other public models like OpenAI's GPT-5.5 and are routinely used by defenders. Access to all other Anthropic models remains unaffected. The blogger independently verified that Fable 5 was still accessible until 6:59pm Pacific Time, after which API calls returned a 404 error.
Simon Willison's browser-based audio conversation tool, originally built in December 2024 to test the OpenAI WebRTC realtime audio API, has been updated. It now supports the GPT‑Realtime‑2 model, which OpenAI promotes as its first voice model with GPT‑5-class reasoning and a knowledge cutoff of September 30, 2024. A new feature allows users to paste document context, enabling interactive voice Q&A about the provided content. The update makes the newer model available for experimentation while the model has not yet appeared in the ChatGPT iPhone app.
The Datasette 1.0a33 alpha release extends the existing ?_extra= URL parameter pattern, previously only available for tables, to also work with SQL queries and individual rows. This new API behavior is now fully documented. Simon Willison built a custom API explorer tool to demonstrate the feature, using Claude Fable 5 for planning and GPT-5.5 xhigh for implementation. The release represents a significant step towards the stable 1.0 version of Datasette.
Anthropic announced it will make the invisible safeguard in Claude Fable 5 that silently degraded responses for frontier LLM development requests visible. Flagged requests will now visibly fall back to Opus 4.8, and the API will return a refusal reason. The company apologized for making the wrong tradeoff, acknowledging that users should have visibility into safeguards. The change follows widespread criticism from the AI research community.
Anthropic released Claude Fable 5 alongside the unguarded Claude Mythos 5, both with 1M context, 128K max output, and Jan 2026 knowledge cutoff. Priced at $10/M input and $50/M output tokens, it is twice the cost of Opus 4.8 and notably slow but performed impressively on code-heavy tasks. Simon Willison found it spontaneously re-implemented his micropython-wasm project with full CPython, and via Claude Code it autonomously added human-in-the-loop tool approval to LLM and Datasette Agent, producing LLM 0.32a3. Its factual recall of niche open-source details suggests a very large model size. Daily usage cost reached $110.42 under a $100/month plan.
Andrej Karpathy observes that working software is increasingly becoming available on tap, triggering Jevons paradox and growing his demand for software. He lists numerous possibilities enabled by AI, such as explainers, visualizers, dashboards, bespoke single-use apps, and automated test suites. He emphasizes the ability to run giant research projects with custom HTML results, encouraging a mindset of infinite possibility. The quote reflects on how AI is transforming software creation and consumption.