## Summary
Adds support for Anthropic's newly released Claude Opus 4.6 model.
## Changes
- Added `claude-opus-4-6` to the `LlmModel` enum
- Added model metadata: 200K context window (1M beta), **128K max output
tokens**
- Added block cost config (same pricing tier as Opus 4.5: $5/MTok input,
$25/MTok output)
- Updated chat config default model to Claude Opus 4.6
## Model Details
From [Anthropic's
docs](https://docs.anthropic.com/en/docs/about-claude/models):
- **API ID:** `claude-opus-4-6`
- **Context window:** 200K tokens (1M beta)
- **Max output:** 128K tokens (up from 64K on Opus 4.5)
- **Extended thinking:** Yes
- **Adaptive thinking:** Yes (new, Opus 4.6 exclusive)
- **Knowledge cutoff:** May 2025 (reliable), Aug 2025 (training)
- **Pricing:** $5/MTok input, $25/MTok output (same as Opus 4.5)
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Co-authored-by: Toran Bruce Richards <toran.richards@gmail.com>
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