finish_reason: REASON_STOP message { content: "Today marks the launch of Grok 4.3 in non-reasoning mode and the r etirement of select xAI API models." role: ROLE_ASSISTANT reasoning_content: "The user message is: “Grok 4.3 non-reasoning launch and xAI API model retirement on May 15, 2026”\nGrok 4.3 non-reasoning model launched today, coinciding with retirement of older xAI API models on May 15, 2026. This transition enhances performance for advanced tasks while ensuring continuity in API services. \n\n## Explanation\n\nThe announcement is interpreted as a coordi nated product update from xAI, with the date of May 15, 2026 serving as the exac t launch and retirement milestone. The non-reasoning variant of Grok 4." } } created { } model: "grok-4-1-fast-reasoning" usage { completion_tokens: 31 prompt_tokens: 2341 total_tokens: 3108 prompt_text_tokens: 2341 reasoning_tokens: 736 cached_prompt_text_tokens: 448 }