Grok 4.20
Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities.
Specifications
| Lab | xAI |
|---|---|
| Context window | 2M tokens |
| Input price | $1.25/1M |
| Output price | $2.50/1M |
| Release | Mar 2026 |
Strengths
- Industry-leading speed with reasoning capabilities
- Massive 2M-token context window largest on the market
- Lowest hallucination rate claimed across all frontier models
- Strong agentic tool calling and strict prompt adherence
Weaknesses
- Reasoning mode adds latency slower than non-reasoning at same speed tier
- xAI ecosystem still smaller than OpenAI/Anthropic
Best for
- Long-context analysis and research
- Agentic workflows requiring reliable tool use
- Applications where hallucination reduction is critical
In Depth: Grok 4.20
Summary
Grok 4.20 is an AI model from xAI.
Released in Mar 2026. It currently appears in the Overall category on LMRank and 1 other category. It takes image and text input and produces text output, with a context window of 2M tokens. Input pricing is $1.25 per 1M tokens and output is $2.50 per 1M tokens on OpenRouter.