Grok 4.20 - Kyma API

Overview

xAI’s 4.20 generation. 2M context, vision, file input, reasoning; the rate doubles above 200K prompt tokens.

Specs

Field	Value
Model ID	`grok-4.20`
Best for	Very long documents and codebases in one prompt
Context window	2M
Max output tokens	8K
Input modalities	Text, Image, File
Output modalities	Text
Tool calling	Yes
Structured outputs	Yes
Prompt caching	No
Vision	Yes
Reasoning	Yes
Speed	Medium
Cost band	Premium
Release stage	Stable

Pricing

	Per 1M tokens
Input	$1.763
Output	$3.528

Above a long prompt this model costs more per token, because the infrastructure serving it charges more there. The threshold is on the prompt, so you know which rate applies before you send.

Prompt length	Input	Output
Standard	$1.763	$3.528
Above 200,000 tokens	$3.375	$6.75

Example

from openai import OpenAI

client = OpenAI(base_url="https://kymaapi.com/v1", api_key="kyma-...")

response = client.chat.completions.create(
    model="grok-4.20",
    messages=[{"role": "user", "content": "..."}],
    tools=[...],  # function calling supported
)

Agent query example

Ask the API which models fit, instead of hardcoding an id:

curl "https://kymaapi.com/v1/models?recommended_for=chat&tools=true&quality_tier=strong"

​Overview

​Specs

​Pricing

​Example

​Agent query example

Overview

Specs

Pricing

Example

Agent query example