Grok 4.20
Grok 4.20 by xAI delivers fast responses, agentic tool calling, strict prompt adherence, and a 2M token context window for long documents and conversations.
Model Overview
Capabilities, design details, and architectural traits
Grok 4.20 – High-Performance Agentic Tool-Calling Model
Grok 4.20 is xAI's high-performance model positioned around agentic tool calling combined with a documented emphasis on minimizing hallucinations and strict prompt adherence. It is built to deliver consistently precise, truthful responses at speed.
Context Strategy
The 2M token context window is the largest officially documented for any Grok model, enabling ingestion of long documents or extended conversation histories in a single request without chunking.
Why It Exists
Officially positioned as a model that pairs throughput and context depth with agentic tool use - suited for workflows where the model must call external tools rapidly while maintaining output accuracy.
Benchmark Performance
Independent evaluations · Artificial Analysis
Accuracy & Capability Details
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| Model Details | |||
|---|---|---|---|
| General Info | |||
| Provider | xAI | Anthropic | Anthropic |
| Release Date | March 10, 2026 | September 22, 2026 | September 28, 2026 |
| Knowledge Cutoff | Sep 2025 | - | Jun 2026 |
| Context & Limits | |||
| Context Window | 1M | 1M | 1M |
| Pricing (per 1M tokens) | |||
| Input Pricing | $1.25 Best Input Pricing | $4 | $2 |
| Output Pricing | $2.50 Best Output Pricing | $20 | $10 |
| Modalities | |||
| Inputs | textimagefile | textimagefile | textimagefile |
| Outputs | text | text | text |
| Benchmarks (0-100) | |||
| Intelligence Index | 25.7 | 57.6 Best Intelligence Index | 56.0 |
| Coding Index | - | - | - |
| Agentic Index | - | - | - |
Humanity's Last Exam
Extremely difficult logical reasoning and knowledge.
Long Context Reasoning
Logical reasoning over long context windows.
SciCode Benchmark
Scientific coding and mathematical modeling.
Independent evaluation data provided by Artificial Analysis. To view the latest benchmarks and full details, visit their official site.
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