Anthropic (@AnthropicAI) confirmed Claude Opus 5.5 is available today; see the same-day @claudeai launch thread. First Claude 5.5 model, Fable 5.1-level on most tasks, ~40% cheaper than Opus 5 on typical workloads.
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Anthropic announced a partnership with Accenture on independent embedded evaluation of frontier AI, part of its commitment to embed evaluators at Anthropic. Both expect to invest at least $1 billion each over five years to build capacity; details at anthropic.com/news/accenture-embedded-evaluation.
Anthropic staff announced that Claude Code 2.1.277 adds AGENTS.md support: if a project folder has no CLAUDE.md, Claude reads AGENTS.md for project instructions, toggleable under Project instructions in /config. The official changelog lists about 87 CLI changes, including fixing silent hangs in claude -p and Agent SDK sessions after internal errors. The feature is not yet available on Bedrock, Vertex, or Foundry.
Anthropic is merging Claude Cowork and chat into one Claude experience: ask a quick question or hand off a report, keep work running after you close the laptop, and Claude asks when unclear while you keep final say. Existing Cowork chats, projects, artifacts, connectors, and skills carry over; Claude Design, Slides, and Docs are in beta on paid plans, rolling out to Pro and Max over the next few weeks.
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