xAI Grok
xAI
xAI's Grok 4.20 boasts a 2M token context window — the largest among frontier models — with multi-agent architecture, real-time X data integration, and the lowest hallucination rate at 78% factual accuracy.
grok.comLast updated: April 20, 2026
$2/M
4.20 Input
2M
Context Window
30K
Max Output
182 t/s
Speed
Available Models
| Model | Input $/1M | Output $/1M | Context | Best For |
|---|---|---|---|---|
| Grok 4.20 (flagship) | $2.00 | $6.00 | 2M | Complex reasoning, research, agents |
| Grok 4.1 Fast | $0.20 | $0.50 | 2M | Speed-first reasoning, search |
| Grok 4 | $2.00 | $6.00 | 2M | Previous gen, still available |
| Grok 3 Mini | $0.30 | $0.50 | 131K | Lightweight tasks |
Consumer Plans
| Plan | Price | Includes |
|---|---|---|
| Free | $0/mo | Limited Grok access via X |
| SuperGrok | $30/mo | Enhanced access, DeepSearch |
| X Premium+ | $40/mo | Full X features + Grok |
| SuperGrok Heavy | $300/mo | Highest limits, priority |
Strengths & Weaknesses
Strengths
- Lowest hallucination rate: 78% factual accuracy (Artificial Analysis)
- Multi-agent architecture (Grok, Harper, Benjamin, Lucas)
- Real-time search and X data integration
- Massive 2M context window at competitive pricing
- 182 tokens/sec — among fastest reasoning models
Weaknesses
- Trails Claude on complex coding (SWE-bench) (Awesome Agents)
- Potential bias toward xAI/Musk-adjacent topics
- ~15s reasoning time to first token on complex queries
Best For
- Real-time information synthesis and fact-checking
- Financial analysis and research
- Agentic tasks requiring low hallucination
- Long-context processing (2M window)
- Speed-critical production workloads
Latest Release NEW
Grok 4.20 Beta 2 — April 2026
- Multi-agent system with enhanced step-back reasoning
- Industry-leading speed and low hallucination rates
- Trained on the Colossus supercluster — largest AI training cluster
- Native tool use and vision capabilities
- 2M token context window — largest commercially available
Previous Releases
Grok 4.20 Beta — February 2026
- Initial beta with multi-agent reasoning architecture
- Introduced step-back reasoning for complex problem solving
- Integrated with X platform for real-time information access
Grok 3 — December 2024
- First Grok model trained on Colossus supercluster
- Major improvements in math, coding, and reasoning
- Set the foundation for the 4.x multi-agent architecture