New models: Opus 4.6 + Codex 5.3

We've added support for the latest AI models from Anthropic and OpenAI!

What's new:

• Added new selectable models: Anthropic claude-opus-4-6 and claude-opus-4-6-1m (1M context)

• Added OpenAI gpt-5.3-codex

Go try the models on TypingMind now!