Is Grok 4.20 Beta available on FastMetal?

Not at the moment. Grok 4.5, from the same lab, is available on the FastMetal API today.

What is the context window of Grok 4.20 Beta?

2,000,000 tokens, shared between the prompt and the response.

x-ai/grok-4-20-beta

Not Available

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

Frequently asked questions

Is Grok 4.20 Beta available on FastMetal?: Not at the moment. Grok 4.5, from the same lab, is available on the FastMetal API today.
What is the context window of Grok 4.20 Beta?: 2,000,000 tokens, shared between the prompt and the response.

Models you can use on FastMetal