anthropic

Effective context engineering for AI agents

good context engineering means finding the smallest possible set of high-signal tokens that maximize the likelihood of some desired outcome

Anthropic releases Claude Sonnet 4.5 claiming it’s

the best coding model in the world.

API price remains the same as earlier versions at

$3/$15 per million tokens.

Also, ccusage deprecates blocks --live as the official way to track claude usage is via claude.ai/settings/usage.

Microsoft announces auto-model selection for VS Code that prioritizes Claude Sonnet 4 over GPT-5 for paid users

How we built our multi-agent research system speaks to Anthropic’s multi-agent build experiences.

We found that a multi-agent system with Claude Opus 4 as the lead agent and Claude Sonnet 4 subagents outperformed single-agent Claude Opus 4 by 90.2% on our internal research eval

However these architectures burn through tokens fast:

In our data, agents typically use about 4× more tokens than chat interactions, and multi-agent systems use about 15× more tokens than chats.

Cognition goes further in Don’t Build Multi-Agents

In some cases, libraries such as swarm by OpenAI and autogen by Microsoft actively push concepts which I believe to be the wrong way of building agents.

Anthropic releases Claude 4.

Pricing remains consistent with previous Opus and Sonnet models: Opus 4 at $15/$75 per million tokens (input/output) and Sonnet 4 at $3/$15.

Claude Opus 4 is our most powerful model yet and the best coding model in the world. GitHub says Claude Sonnet 4 soars in agentic scenarios and will introduce it as the model powering the new coding agent in GitHub Copilot

Claude Code, now generally available, brings the power of Claude to more of your development workflow - new beta extensions for VS Code and JetBrains integrate Claude Code directly into your IDE. Beyond the IDE, we’re releasing an extensible Claude Code SDK, so you can build your own agents and applications using the same core agent as Claude Code.

Claude now has web search but it’s only

available now in feature preview for all paid Claude users in the United States. Support for users on our free plan and more countries is coming soon.

Claude 3.7 Sonnet and Claude Code - hybrid reasoning model, same price as claude 3.5, improved accuracy. Also a terminal-based agentic coding tool, however this requires an api key.

On DeepSeek and Export Controls - CEO of Anthropic shares his take on DeepSeek - It’s not as good as everyone says it is, but China needs to be further restricted from chips anyway.

Claude 3.5 Sonnet (new)

Early customer feedback suggests the upgraded Claude 3.5 Sonnet represents a significant leap for AI-powered coding.

Amazon pours additional $2.75bn into AI startup Anthropic

Extra financing will bring technology giant’s total investment in OpenAI rival to $4bn

Introducing the next generation of Claude

The family includes three state-of-the-art models in ascending order of capability: Claude 3 Haiku, Claude 3 Sonnet, and Claude 3 Opus.