Release Notes: - Added support for Grok 4.1 Fast (reasoning and non-reasoning) models in the xAI provider, with 2M token context windows and full vision capabilities. - Extended 2M token context to existing Grok 4 Fast variants (from 128K) for consistency with xAI updates. - Enabled image/vision support for all Grok 4 family models. Doc: https://docs.x.ai/docs/models/grok-4-1-fast-reasoning https://docs.x.ai/docs/models/grok-4-1-fast-non-reasoning