by Grok
Grok-4-fast is a cost-effective inference model developed by xAI that delivers cutting-edge performance with excellent token efficiency. The model features a 2 million token context window, advanced Web and X search capabilities, and a unified architecture supporting both "inference" and "non-inference" modes. Compared to Grok 4, it reduces thinking tokens by an average of 40% and lowers the price by 98% while achieving the same performance.
Grok-4-fast is a cost-effective inference model developed by xAI that delivers cutting-edge performance with excellent token efficiency. The model features a 2 million token context window, advanced Web and X search capabilities, and a unified architecture supporting both "inference" and "non-inference" modes. Compared to Grok 4, it reduces thinking tokens by an average of 40% and lowers the price by 98% while achieving the same performance.
grok-4-fast-non-reasoning has a 2,000,000 token context window.
On AIHubMix, grok-4-fast-non-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-fast-non-reasoning accepts text and image input.
grok-4-fast-non-reasoning supports tool calling, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.
grok-4-fast-non-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-fast-non-reasoning — no other code changes needed.
grok-4-fast-non-reasoning is developed by Grok. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
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…
Grok 4.20 is our newest flagship model with industry-leading speed and agentic tool…
Use grok-4-fast-non-reasoning via the AIHubMix unified API — one interface for every major LLM.