Added support for new Claude models including the Sonnet 4 and Opus 4 series (e.g., claude-sonnet-4-20250514,
claude-opus-4-20250514) across various providers. The default sonnet and opus aliases were updated to these newer
versions.
Added support for the vertex_ai/gemini-2.5-flash-preview-05-20 model.
Fixed OpenRouter token cost calculation for improved accuracy.
Updated default OpenRouter models during onboarding to deepseek/deepseek-r1:free for the free tier and
anthropic/claude-sonnet-4 for paid tiers.
Automatically refresh GitHub Copilot tokens when used as OpenAI API keys, by Lih Chen.