About
Grok 4.20 Beta is xAI's newest flagship model with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)
Related Models
Pricing
Input
$2.00
per 1M tokens
Output
$6.00
per 1M tokens
Blended
$3.00
per 1M tokens
Cheaper than 20% of models. Median price is $0.54/1M tokens.
Cost Calculator
Tokens per day1M
100K100M
Daily
$3.00
Monthly
$90.00
vs. Similar Models
Grok 4.20 0309 (Reasoning)
$3.000%
Mistral: Mistral Medium 3.5
$3.000%
Grok 4.20 0309 (Non-reasoning)
$3.000%
Grok 4.20 0309 v2 (Non-reasoning)
$3.000%
Performance
Context Window
2.0M
tokens
Larger than 98% of models
Context Window Comparison
xAI: Grok 4.20
2.0MSame
Grok 4.1 Fast (Non-reasoning)
2.0MSame
Grok 4 Fast (Non-reasoning)
2.0MSame