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Changelog

Latest updates and changes to Claude Code API.

2026-04

  • 1M-token context (beta) available for Opus 4.6 and Sonnet 4.6 — enable with header anthropic-beta: context-1m-2025. Same per-token rate as 200K.
  • Public model discovery — GET /v1/models now returns the canonical list with context_window, supports_1m_context and supports_thinking flags. Use it as the source of truth in CI.
  • Liveness probe — public /healthz endpoint for monitoring.
  • Chat Sandbox: smart user-bubble layout fix — short messages no longer collapse to single-letter columns.

2025-04

  • Claude Opus 4.6 — flagship model
  • Improved streaming latency across all models
  • Enhanced error messages with more specific error types

2025-03

  • Claude Sonnet 4.5 — balanced model with improved coding performance
  • Added per-key credit limits
  • OpenAI-compatible streaming improvements
  • New documentation site

2025-02

  • Initial release of Claude Code API v2
  • Anthropic and OpenAI-compatible endpoints
  • Support for Claude Opus 4.5, Sonnet 4, and Haiku 4.5
  • Credit-based billing system

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