Summary
A data leak has surfaced and been confirmed by Anthropic: the company is developing a new model called Claude Mythos, positioned as an entirely new tier above the existing Opus line. A draft blog post discovered in an unsecured, publicly searchable database describes Mythos as ‘by far the most powerful AI model we’ve ever developed,’ with an Anthropic spokesperson confirming it represents a ‘step change’ in capability compared to Claude Opus 4.6, with notable gains in software coding, academic reasoning, and cybersecurity benchmarks. The model was also reportedly referred to by the internal codename Capiara.
Anthropic’s draft post acknowledges that Mythos is significantly more compute-intensive and expensive to serve than current models, and signals an intentionally slow rollout. The company is currently trialing the model with a small group of early access customers focused specifically on cybersecurity applications, with the stated goal of understanding the model’s risk profile before any general release — an unusually cautious posture even by Anthropic’s standards.
The AI Daily Brief episode also covers several other announcements: Google’s Gemini 3.1 Flash Live, a real-time conversational voice model with improved interruption handling already deployed by Home Depot; Shopify’s new Tinker app, a free mobile tool offering over 100 AI tools for e-commerce merchants including logo generation, product photography, and ad video creation; and an OpenAI Codex upgrade adding plugin support for planning and research workflows. The Mythos confirmation is the headline given its direct sourcing from Anthropic.
📺 Source: The AI Daily Brief: Artificial Intelligence News · Published March 29, 2026
🏷️ Format: News Analysis
