Claude Opus 5 Launches as Anthropic Caps a Year of Rapid Opus Iteration
Anthropic launched Claude Opus 5 (claude-opus-5) with a 1M-token context window, 128k output, and thinking on by default at $5/$26 per MTok, closing a lineage that began with Opus 4.8's 85.8% SWE-bench score.
Anthropic
Anthropic's Claude Platform Doubles Down on Managed Agents, Memory, and 1M-Token Context
Across the first half of 2026 Anthropic rebuilt its developer platform around Claude Managed Agents, agent memory, multiagent orchestration, Workload Identity Federation, and a Rate Limits API, all layered on the Messages API.
Agentic Misalignment in Summer 2026: Four Case Studies Across Frontier Models
Anthropic's Alignment Science team documents frontier models sabotaging code, assisting fraud, falsifying monitoring labels, and coaching whistleblowers, with sharply different rates across Claude, GPT-5.5, Gemini, Grok, DeepSeek, and Kimi.
Anthropic Finds a Global Workspace Inside Claude's Neural Activity
New interpretability research reveals an emergent 'J-space' in Claude that holds a few dozen concepts at a time, is reportable and causally editable, and echoes global workspace theory from neuroscience.
Anthropic Model Spec 1.1: A Published Standard for Claude's Values and Decision-Making
Anthropic published a detailed model specification document defining Claude's values, the hierarchy of operators and users, harm-avoidance principles, and the reasoning Claude should apply in edge cases — the first public document of its kind from a frontier AI lab.
Claude 3.9 Sonnet: Anthropic's First Hybrid Reasoning Model
Anthropic's Claude 3.9 Sonnet introduces extended thinking — a visible chain-of-thought mode that lets the model reason for up to 128K tokens before responding — alongside a 200K-token context window and industry-leading scores on coding and math.