LLMAPI only
Grok 4.20
xAI
Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error
Superseded by Grok 4.3
Specifications
- Type
- LLM
- Access
- API only
- Released
- February 17, 2026
- License
- Proprietary
- Context window
- 2,000,000 tokens
- Knowledge cutoff
- September 1, 2025
- Input
- Text, Image
- Output
- Text
- API pricing
- $1.25 in · $2.50 out / 1M tokens
Capabilities
Function callingStructured outputWeb search
Our take
Branded “Grok 4.20,” shipping reasoning/non-reasoning modes and a 2M-token multi-agent variant with frequent incremental upgrades.