xAI Shipped Its Latest Model, Grok-4.3, with 1M Token Context Window and Low Price API

IBL News | New York

Elon Musk’s xAI shipped its latest LLM, Grok 4.3, marking a leap in performance over its competitors OpenAI, Anthropic, Google, and Chinese firms DeepSeek, Moonshot (Kimi), Alibaba (Qwen), z.ai, and others — despite still remaining below the latest models from OpenAI and Anthropic.

In addition to its freewheeling personality and image generation policy, the marquee feature is the low price point for developers via the API, at $1.25 per million input tokens and $2.50 per million output tokens, compared to its direct predecessor Grok 4.2’s initial API pricing of $2/$6 per million input/output tokens.

According to the company, Grok 4.3 is built with reasoning as an active, permanent state. It means that the model is designed to “think” before it speaks for every query, a strategy intended to maximize factual accuracy and handle complex, multi-step instructions.

The model’s memory is equally expansive, featuring a 1 million-token context window — roughly equivalent to several thick novels.

It is specifically optimized for agentic workflows—scenarios where an AI is not just answering a question but acting as an autonomous agent to complete a task.

The model can design 9-slide PowerPoint decks, utilizing a “Sandwich Structure” (dark titles/conclusions with light content) and integrating data-driven decision matrices and humor.

xAI also introduced Custom Voices, a sophisticated voice-cloning API and web-based voice cloning creation suite.

This product allows users to clone their voice at high quality in a minute or two. Once cloned, the “voice ID” can be used across xAI’s Text-to-Speech (TTS) and Voice Agent APIs.

Access to the new Voice Agent API is billed at a flat rate of $3.00 per hour ($0.05 per minute) for speech-to-speech interactions.

Grok https://t.co/NI6rEuwIKK

— Elon Musk (@elonmusk) May 1, 2026