Claude Opus 5 is a new model that delivers frontier-level intelligence close to Claude Fable 5 at half the price, achieving state-of-the-art results on coding and knowledge work benchmarks like Frontier-Bench and GDPval-AA. It more than doubles the performance of its predecessor Opus 4.8 at lower cost, with significant improvements in software engineering, scientific research, computer use, and agentic tasks. It becomes the new default model on Claude Max and the strongest model on Claude Pro.

Anthropic launched Claude for Teachers, offering verified US K-12 educators free access to premium Claude capabilities, including a Learning Commons connector for standards-aligned lesson planning across all 50 states. The platform integrates with 9 third-party K-12 tools (e.g., MagicSchool, Canva Education, ASSISTments) and includes Claude Code and Cowork for autonomous task execution like data analysis and scheduling. Teachers gain tailored teaching skills co-developed with Learning Commons, grounded in learning science.

Anthropic introduced Claude Science, an AI workbench for scientists that integrates tools and packages researchers commonly use into a single research environment. It produces auditable artifacts with reproducible outputs, manages compute resources including HPC clusters and on-demand GPUs, and provides access to over 60 curated skills and connectors for genomics, single-cell, proteomics, structural biology, cheminformatics, and more. It is released in beta for Claude Pro, Max, Team, and Enterprise users.

Claude Sonnet 5 is a significantly more agentic model than its predecessor Sonnet 4.6, with performance close to Opus 4.8 but at lower prices. It shows substantial improvements in reasoning, tool use, coding, and knowledge work, and can complete complex multi-step tasks autonomously where previous Sonnet models would stop short. It also demonstrates improved safety with lower rates of undesirable behaviors in agentic contexts.

Anthropic introduced Claude Tag, a new way for teams to work with Claude starting on Slack, where Claude joins as a team member in channels. It features multiplayer collaboration, persistent memory across channels, proactive ambient behavior, and asynchronous task execution. It is available in beta for Claude Enterprise and Team customers.

Claude Fable 5 is a Mythos-class model made safe for general use, exceeding capabilities of any previously released Claude model across software engineering, knowledge work, vision, scientific research, and more. It features conservative safeguards for cybersecurity-related queries, falling back to Claude Opus 4.8 for flagged requests in less than 5% of sessions. Pricing is set at $10 per million input tokens and $50 per million output tokens, less than half the price of Claude Mythos Preview.

Claude Opus 4.8 builds on Opus 4.7 with improvements across benchmarks in coding, agentic skills, reasoning, and practical knowledge work. It features better judgment in agentic tasks, more efficient tool calling, and a fast mode that operates at 2.5x speed at three times cheaper than previous models. New features include user-controlled effort levels on claude.ai and dynamic workflows in Claude Code for large-scale problems.

Anthropic introduced Claude Sonnet 4.6, described as delivering frontier performance across coding, agents, and professional work at scale. This represents a new version in the Sonnet model line.

Extended thinking mode introduced. Biggest leap in coding and reasoning. Computer use improved.

Outperforms Claude 3 Opus at twice the speed. Sets new benchmark for coding tasks.

Most capable Claude model at launch. Beats GPT-4 on most benchmarks. Three tier family introduced.

Major upgrade. Context window expanded to 100K tokens. Improved reasoning and safer responses.

Initial public release of Claude. Focused on being helpful, harmless and honest.