SpaceXAI: Grok 4.5

proprietary

Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.

Context
500K
Max output
450K
Input price
$2/1M tokens
Output price
$6/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDx-ai/grok-4.5
Provider OpenRouter
Creator xAI
Familygrok-4.5
Licenseproprietary
Status—
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window500K tokens
Max input—
Max output450K tokens
Reasoning tokens—
Knowledge cutoff
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$2
Output
$6
Cache write
—
Cache read
$0.3
Batch in
—
Batch out
—

API

GET/v1/models/openrouter/x-ai/grok-4.5

SpaceXAI: Grok 4.5

x-ai/grok-4.5

Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.

Changes · 6 entries
x-ai/grok-4.5createca7a400Nov 2, 2026, 03:02 AM
x-ai/grok-4.5updatee3d7dedAug 31, 2026, 04:13 AM
max_output_tokens450000
x-ai/grok-4.5update3cddff5Aug 13, 2026, 02:54 AM
descriptionGrok 4.5 is SpaceXAI's smartest model with frontier perfo...→Grok 4.5 is a model from SpaceXAI with frontier performan...
x-ai/grok-4.5update19c9fe3Aug 5, 2026, 03:04 PM
namexAI: Grok 4.5→SpaceXAI: Grok 4.5
x-ai/grok-4.5updatebf78dcfJul 25, 2026, 05:49 AM
pricingcached input$0.5→$0.3
x-ai/grok-4.5createb983d60Jul 9, 2026, 02:38 AM