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✨ Features

• Anthropic Default Fallback Routing — Added support for Anthropic’s fallbacks: "default" preset, preserving it through the Bifrost round-trip and injecting the server-side-fallback-2026-07-01 beta header for default-routing requests.
• Mid-Conversation Tool Changes — Added support for the mid-conversation-tool-changes-2026-07-01 beta header, enabled for Anthropic and Bedrock Mantle.

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🐞 Fixed

• Opus 5 Compatibility — Added Opus 5 detection to the Anthropic provider so it inherits Opus 4.8’s request surface: budget_tokens, temperature, top_p, and top_k are stripped, and native effort, fast mode, and mid-conversation system messages are enabled.