grok-4-1-fast-reasoning · Grok
Grok 4.1 is a new conversational model with significant improvements in real-world usability, delivering exceptional performance in creative, emotional, and collaborative interactions. It is more perceptive to nuanced user intent, more engaging to converse with, and more coherent in personality, while fully preserving its core intelligence and reliability. Built on large-scale reinforcement learning infrastructure, the model is optimized for style, personality, helpfulness, and alignment, and leverages frontier agentic reasoning models as reward evaluators to autonomously assess and iterate on responses at scale, significantly enhancing overall interaction quality.
Grok 4.1 is a new conversational model with significant improvements in real-world usability, delivering exceptional performance in creative, emotional, and collaborative interactions. It is more perceptive to nuanced user intent, more engaging to converse with, and more coherent in personality, while fully preserving its core intelligence and reliability. Built on large-scale reinforcement learning infrastructure, the model is optimized for style, personality, helpfulness, and alignment, and leverages frontier agentic reasoning models as reward evaluators to autonomously assess and iterate on responses at scale, significantly enhancing overall interaction quality.
grok-4-1-fast-reasoning has a 2,000,000 token context window.
On AIHubMix, grok-4-1-fast-reasoning costs $0.2 per million input tokens and $0.5 per million output tokens. Cached input reads are billed at $0.05 per million tokens.
grok-4-1-fast-reasoning accepts text and image input.
grok-4-1-fast-reasoning supports thinking, tool calling, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.
grok-4-1-fast-reasoning is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to grok-4-1-fast-reasoning — no other code changes needed.
grok-4-1-fast-reasoning is developed by Grok. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
Grok 4.6 is xAI’s (SpaceXAI) flagship multimodal reasoning model for coding, long-running…
Grok 4.5 was trained on datasets spanning knowledge in coding, science, engineering, and…
Fast coding model trained specifically for agentic coding workflows.
Grok 4.3 is amongst the leading models in intelligence and well priced when comparing to…
Grok 4.2 is xAI’s latest large language model, built for strong reasoning, multimodal…
Grok 4.2 is xAI’s latest large language model, built for strong reasoning, multimodal…
Use grok-4-1-fast-reasoning via the AIHubMix unified API — one interface for every major LLM.