Claude Sonnet 4 has been upgraded to support up to 1 million tokens of context on the Anthropic API, marking a fivefold increase that enables the processing of extensive codebases and numerous research papers in a single request. This enhancement, now in public beta on the Anthropic API and Amazon Bedrock, and soon on Google Cloud's Vertex AI, allows for more comprehensive and data-intensive applications such as large-scale code analysis, document synthesis, and context-aware agent building. The pricing for using this extended context varies, with higher costs for prompts exceeding 200K tokens, and potential cost savings through batch processing and prompt caching. Companies like Bolt.new and iGent AI are already leveraging this capability to transform web development and software engineering respectively, with the former citing improved code generation workflows and the latter claiming a new paradigm in agentic software engineering. The extended context feature is initially available to customers with higher-tier access, with plans for broader availability and potential integration into other Claude products.