Claude Sonnet 4 Expands to 1 Million Token Context Window

Anthropic has increased Claude Sonnet 4's context window to 1 million tokens, five times its previous limit. Now in public beta via Anthropic API and Amazon Bedrock, this allows processing entire codebases or numerous long documents in one request. It especially benefits context-aware agents managing complex workflows. While developers appreciate the expanded capacity, some question its impact on performance and express concerns about increased costs. The feature is currently available to higher-tier customers, with broader access planned soon.