xAI Launches Grok 4.3 at 37% Lower Cost, Adds Voice Cloning Suite

Quick Facts

• Grok 4.3 API costs $1.25 per million input tokens and $2.50 per million output tokens, 37.5% and 58.3% lower than previous version
• New voice cloning technology creates production-ready voice models from 120-second audio clips in under two minutes
• Model scores 53 on Artificial Analysis Intelligence Index, ranking above average but behind GPT-5.5 and Claude Opus 4.7

xAI launched Grok 4.3 on April 30, 2026, marking Elon Musk’s company’s most aggressive pricing move yet in the AI market. The new large language model comes with API pricing significantly below competitors and a voice cloning suite targeting enterprise automation workflows.

The company priced Grok 4.3 at $1.25 per million input tokens and $2.50 per million output tokens for requests up to 200,000 tokens. This represents a 37.5% reduction in input costs and 58.3% reduction in output costs compared to Grok 4.20, positioning xAI as what the company calls the “value leader for enterprise applications.”

Grok 4.3 features a 1 million-token context window and built-in reasoning capabilities designed to “think” before responding to queries. The model includes web search, X integration, code execution, and file search with retrieval-augmented generation capabilities.

Performance benchmarks show mixed results. Grok 4.3 scored 53 on the Artificial Analysis Intelligence Index, placing it above the average of 35 but trailing GPT-5.5 at 60 and Claude Opus 4.7 at 57. The model excelled in specialized tasks, ranking first on CaseLaw v2 with 79.3% accuracy and achieving a 25-point improvement in legal reasoning over its predecessor.

The voice cloning suite allows developers to create custom voices from audio clips as short as 120 seconds. The system supports over 80 voices across 28 languages and includes security features requiring speakers to read verification phrases. Voice services are priced at $3.00 per hour for speech-to-speech interactions.

“When training Grok 4.3, we spoke directly with devs and businesses to understand what they actually needed: a model that’s fast, affordable, and great at tool calling,” said Eric Jiang from xAI.

The launch comes after significant turnover at xAI, with all 10 original co-founders and dozens of researchers leaving the company. The aggressive pricing strategy signals xAI’s attempt to compete on cost efficiency as the AI market matures and enterprises seek practical automation solutions.

Industry reception has been mixed. Professional benchmarkers noted a “stark gap” between domain-specific strengths and general reasoning consistency. Community reports describe occasional issues with the model’s “always-on reasoning” feature, suggesting it may sometimes overthink simple tasks.

Read more: xAI launches Grok 4.3 at an aggressively low price and a new, fast, powerful voice cloning suite