SpaceXAI: Grok 4.20

Name: SpaceXAI: Grok 4.20
Author: OpenRouter

proprietary

Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities.

Context

Max output

1.8M

Input price

$1.25/1M tokens

Output price

$2.5/1M tokens

Capabilities

Show unsupported (4)

Reasoning & Interaction

Reasoning

Tool Calling

Output Control

Structured Output

JSON Mode

Details

Model IDx-ai/grok-4.20

ProviderOpenRouter

CreatorxAI

Familygrok-4.20

Licenseproprietary

Status—

Typechat

Input modalitiestext, image

Output modalitiestext

Open weightNo

Parameters—

Architecture—

Context window2M tokens

Max input—

Max output1.8M tokens

Reasoning tokens—

Knowledge cutoff—

Release date2026-03-31

Sourceofficial

Tools

Function Callingfunction_calling

Call external functions and APIs

Pricing

Input

$1.25

Output

$2.5

Cache write

—

Cache read

$0.2

Batch in

—

Batch out

—

Family Comparison: grok-4.20

Model	Caps	Perf	Speed	Context	Max out	Pricing
SpaceXAI: Grok 4.20 Multi-Agent	RJJM	—	—	2M	1.8M	$1.25$2.5
SpaceXAI: Grok 4.20	RTJJM	—	—	2M	1.8M	$1.25$2.5
xAI: Grok 4.20 Beta	RTJJM	—	—	2M	—	$2$6
xAI: Grok 4.20 Multi-Agent Beta	RJJM	—	—	2M	—	$2$6

API

GET/v1/models/openrouter/x-ai/grok-4.20

SpaceXAI: Grok 4.20

x-ai/grok-4.20

Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities.

Changes · 6 entries

x-ai/grok-4.20updateca7a400Nov 2, 2026, 03:02 AM

namexAI: Grok 4.20→SpaceXAI: Grok 4.20

descriptionGrok 4.20 is xAI's newest flagship model with industry-le...→Grok 4.20 is a reasoning model from SpaceXAI with industr...

max_output_tokens1800000

x-ai/grok-4.20updatee3d7dedAug 31, 2026, 04:13 AM

max_output_tokens1800000

x-ai/grok-4.20update19c9fe3Aug 5, 2026, 03:04 PM

namexAI: Grok 4.20→SpaceXAI: Grok 4.20

descriptionGrok 4.20 is a reasoning model from xAI with industry-lea...→Grok 4.20 is a reasoning model from SpaceXAI with industr...

x-ai/grok-4.20updatec3b810cMay 11, 2026, 07:02 AM

descriptionGrok 4.20 is xAI's newest flagship model with industry-le...→Grok 4.20 is a reasoning model from xAI with industry-lea...

x-ai/grok-4.20updatebc0fb7dMay 2, 2026, 02:14 AM

pricinginput$2→$1.25output$6→$2.5

x-ai/grok-4.20create22fb110Apr 1, 2026, 10:05 AM