v4.0

AIProxyOauth 4.0

Connect Claude Code and other Anthropic Messages clients to eligible Copilot
models using explicit copilot/ names.

Changes:

• Route POST /v1/messages to Copilot only when the account model catalog
  explicitly advertises that endpoint. Works on Copilot-only servers.
• Preserve native request fields, tools, JSON responses, SSE events, and usage.
  Forward validated version/beta headers using the proxy's Copilot credential.
• Keep unqualified and anthropic/ Messages requests on Anthropic.
  Unsupported models are rejected without provider or protocol failover.
• Share bounded native response delivery, with disconnect and size-limit tests.
• Add Claude Code setup instructions, including effort=auto for Haiku.

Validation:

• 611 Java tests and 23 offline Python tests pass.
• Live Copilot Haiku tests passed for JSON, streaming, tool calls, and tool results.
• User confirmed Claude Code Sonnet and Haiku operation, including Haiku tools.

Limits:

• Native Copilot model-picker discovery and token counting are not included.
• Claude Code may show unrecognized-model and classifier billing notices.
• Copilot's upstream SSE terminator is preserved; the proxy adds no sentinel.
• Enterprise Cloud and other Claude Code features remain live-unverified.

Requires Java 21 and an account with access to the selected provider/model.

Download AIProxyOauth-4.0.jar and run:
java -jar AIProxyOauth-4.0.jar --help

Full Changelog: v3.1.1...v4.0