Grok 4.20 Leads April 2026 with Multi-Agent Beta and 2M Context Window
xAI has shipped Grok 4.20, and the numbers are striking. The new model sports a 2 million token context window — enough to process entire codebases, legal documents, or research archives in a single pass — while hitting a throughput of 265 tokens per second, one of the fastest output speeds measured for any frontier model. For developers working with the xAI API, it starts at $2.00 per million input tokens, a competitive price point that undercuts several comparable models.
The more consequential feature may be the Multi-Agent Beta architecture. Grok 4.20 can now orchestrate networks of sub-agents, dividing complex tasks across parallel threads and synthesizing results — the kind of capability that enterprise customers building automation pipelines have been waiting for. Combined with a 65% reduction in hallucination rate compared to Grok 4.1, the model also posts an agentic index score of 68.7, the highest ever recorded for a Grok release.
xAI is making a pointed play for the enterprise agentic market, a space where OpenAI's GPT-4o class models and Anthropic's Claude have held a strong lead. Grok 4.20's combination of speed, long context, and multi-agent coordination addresses the exact requirements that large-scale deployments demand. Whether this release closes the enterprise gap or simply tightens it will depend on how quickly developers build production workflows around it — but the technical foundation is now squarely in the conversation.