Claude Sonnet 5.5 now available on AI Gateway

Anthropic’s latest model, Claude Sonnet 5.5, has been integrated into Vercel’s AI Gateway under the identifier anthropic/claude-sonnet-5.5. The update focuses on enhancing performance for routine tasks such as feature development, debugging, and document generation. Sonnet 5.5 demonstrates stronger multi-step reasoning in coding workflows, verifying its outputs before finalizing results. The model also refines its ability to produce polished documents, slides, and spreadsheets with minimal revisions required.

Sonnet 5.5 introduces improvements in interacting with desktop applications and interpreting charts and technical diagrams. The model supports Zero Data Retention when used through AI Gateway, aligning with privacy-focused deployment. Developers can access it via the AI SDK, OpenAI-compatible Chat Completions API, Responses API, or Anthropic Messages API. Integration with coding agents is streamlined through the command npx vercel ai-gateway setup.

AI Gateway consolidates access to multiple models under a single API, simplifying usage tracking and cost management. The service allows users to configure routing, retries, and failover policies for reliability. Access is available using an AI Gateway API key or by supplying a provider-specific key. The model is also accessible through AI Gateway’s model playground for testing and evaluation.

Vercel’s AI Gateway serves as a unified interface for interacting with various AI models, including Sonnet 5.5. The platform aggregates usage metrics and spending across providers, enabling centralized oversight. Users can switch between models or providers without altering their application code, reducing operational complexity. The integration of Sonnet 5.5 expands the available toolset for developers working within the AI Gateway ecosystem.