Grok 4.20 Beta

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)

3/12/2026

2,000,000 tokens

Specifications

Modalities

Input

text

image

Output

text

Supported Parameters

include_reasoning

logprobs

max_tokens

reasoning

response_format

seed

structured_outputs

temperature

tool_choice

tools

top_logprobs

top_p