Core Insights - Anthropic announced that Claude Sonnet 4 now supports a context window of up to 1 million tokens, which is five times larger than before, enabling developers to handle entire large codebases or multiple research papers in a single request [2][6]. Group 1: Context Window Capabilities - The long context support is currently in public beta on the Anthropic API for Tier 4 customers and those with custom rate limits, with plans for broader rollout in the coming weeks [4]. - The 1 million token context window allows Claude to process unprecedented amounts of information, supporting more comprehensive and data-intensive complex tasks [6]. - Developers can utilize Claude for large-scale code analysis, enabling the model to deeply understand project architecture and identify cross-file dependencies [6]. Group 2: Document Processing and Intelligent Agents - Claude can synthesize vast amounts of documents, such as legal contracts and academic papers, while maintaining full context to analyze complex relationships among hundreds of documents [7]. - Developers can build context-aware agents that maintain context across numerous tool calls and multi-step workflows, ensuring coherent behavior without losing critical information [7]. Group 3: Pricing Model and Cost Optimization - Anthropic has adjusted its pricing structure for prompts over 200K tokens to account for the increased computational resources required, with specific input and output prices outlined [8]. - Developers can reduce latency and costs for long context applications by using prompt caching and can save an additional 50% by utilizing batch processing for tasks involving 1 million tokens [8]. Group 4: User Feedback and Industry Impact - Early users have praised the update, highlighting its impact on production-level AI engineering, with companies like Bolt.new and iGent AI reporting significant improvements in their workflows and capabilities [9]. - The ability to handle 1 million tokens has unlocked new paradigms in software engineering, allowing for extended development sessions on real-world codebases [9].