Feat: add support for Grok 4.1 Fast models (#16936)
* feat: Add support for Grok 4.1 Fast models
Add new xAI Grok 4.1 Fast models optimized for high-performance agentic tool calling:
- xai/grok-4-1-fast (alias for grok-4-1-fast-reasoning)
- xai/grok-4-1-fast-reasoning (with reasoning capabilities)
- xai/grok-4-1-fast-reasoning-latest
- xai/grok-4-1-fast-non-reasoning (without reasoning for faster responses)
- xai/grok-4-1-fast-non-reasoning-latest
Features:
- Context window: 2,000,000 tokens
- Pricing: $0.20/1M input, $0.50/1M output tokens
- Cached tokens: $0.05/1M tokens
- Supports: Function calling, Structured outputs, Vision, Audio input, Web search, Reasoning
Fixes #16927
* docs: Add comprehensive Grok models documentation
- Add 'Supported Models' section highlighting new Grok 4.1 Fast models
- Include comparison guide for reasoning vs non-reasoning models
- Add complete model family table (Grok 4.1, 4, 3, Code, 2)
- Add features legend explaining capabilities
- Remove pricing details (link to xAI docs instead for current rates)
- Improve documentation clarity and consistency
Related to #16927
* docs: Minor corrections to xai.md
1c65800f4a