Build Anything with Claude, Here's How

Anthropic's latest updates to Claude, including Sonnet 4.5 and Claude Code 2.0, offer significant advancements in AI programming and agent capabilities, making it a powerful tool for developers despite its differences from OpenAI's Codex.

• Sonnet 4.5 and Claude Code 2.0 significantly enhance Claude's capabilities for coding and agent development.

• New browser extension and Agent SDK allow AI agents to interact with browsers and build reliable software.

• Combine Claude and Codex to leverage their distinct strengths for efficient and powerful AI programming.

Anthropic has released major updates to Claude, including Sonnet 4.5, which is presented as a powerful and cost-effective model excelling in software engineering benchmarks, and Claude Code 2.0 with significant UI and functionality improvements. A new browser extension allows AI agents to control the browser, and the Agent SDK provides developers with the same infrastructure used to build Claude Code. The speaker emphasizes leveraging both Claude and Codex for different strengths to maximize AI programming efficiency.

Claude Sonnet 4.5 & Code 2.0

• 00:00:28 Anthropic's new Sonnet 4.5 model is described as a world-leading model, five times cheaper than Opus 4.1 while outperforming it on most benchmarks, particularly in software engineering's SWE Bench-Verified. Alongside this, Claude Code 2.0 introduces major upgrades like conversation checkpoints, a revamped terminal, context editing, and IDE extensions, making it the most significant update to Claude Code to date.

Advanced Agent Capabilities

• 00:06:47 Anthropic has introduced an official Claude browser extension, enabling AI agents to control and interact with web browsers, offering a privacy-first alternative to existing AI-powered browsers. This allows agents to perform tasks like managing email inboxes, leveraging a pilot program for access, and can be automated with scheduled shortcuts. Developers can also use the Agent SDK, providing the underlying infrastructure of Claude Code to build sophisticated AI agents that follow a feedback loop of gathering context, taking focused actions, and verifying their work for reliability.

Optimizing Time to First Token

• 00:26:08 A novel algorithm is proposed to optimize 'time to first token' in chat applications by leveraging Anthropic's API with Claude 4.5 Sonnet. This involves silently sending a message to the API when a user pauses typing for over 700 milliseconds, allowing the response to be preloaded and displayed instantly upon the user pressing enter. While potentially costly for free users, this proof-of-concept demonstrates how adaptive preloading based on typing patterns can significantly enhance the user experience in AI chat applications.

Claude vs. Codex Workflow

• 00:52:08 For optimal AI programming, it is crucial to use both Claude Code and OpenAI's Codex, each excelling in different scenarios. Claude Code is a 'friendly co-worker' ideal for quick, safe changes and learning due to its excellent explanation and formatting capabilities. Codex, particularly with GPT-5 high, is a 'genius programmer' best suited for risky changes, deep bug fixes, or major refactors due to its deeper reasoning and preparation, despite being less pleasant to work with. Integrating both tools and understanding their strengths allows developers to operate at the cutting edge of AI programming.