xAI · MultimodalReleased 2026-07-08

grok-4.5

xai/grok-4.5 id

SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.

ReasoningTool useChatWeb search

Type

Use grok-4.5

# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'xai/grok-4.5',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })

500K

CONTEXT WINDOW

500K

MAX OUTPUT

$2.20/M

INPUT · PER M

$6.60/M

OUTPUT · PER M

PRICING

List prices, every modality.

Rate	Per million tokens · USD
Input	$2.20/M
Output	$6.60/M
Cache read	$0.330/M

Honest list pricesHow we calculate prices

Other xAI models

See all 21

Model

Input

Output

Context

Type

grok-4.6Grok 4.6 builds on Grok 4.5 with a particular focus on long-running agents and more ambitious interactive and visual work. It stays with complex tasks across many steps, whether researching a topic, analyzing information, working across a codebase, or turning an idea into a polished application or work artifact.REASONINGTOOLS
Input
$2.20/M
Output
$6.60/M
Context
500K
grok-imagine-image-2.0
Input
—
Output
—
Context
—
grok-voice-think-fast-2.0Grok Voice Think Fast 2.0, our next-generation voice model with improved intelligence, transcription accuracy, and conversational capabilities.
Input
—
Output
—
Context
—
grok-imagine-video-1.5
Input
—
Output
—
Context
—
grok-imagine-video-1.5-preview
Input
—
Output
—
Context
—
grok-build-0.1xAI's fast coding model trained specifically for agentic coding.REASONINGTOOLSWEB
Input
$1.10/M
Output
$2.20/M
Context
256K
grok-4.3Grok 4.3 is a new model matching the scale of Grok 4.20 with an improved architecture and a December 2025 knowledge cutoff.REASONINGTOOLSWEB
Input
$1.38/M
Output
$2.75/M
Context
1M
grok-voice-think-fast-1.0Build real-time voice applications powered by Grok. Stream audio and text bidirectionally via WebSocket for voice assistants, phone agents, and interactive voice systems.
Input
—
Output
—
Context
—
grok-sttTranscribe audio to text in 25 languages with batch and streaming modes.
Input
—
Output
—
Context
—
grok-ttsGenerate speech with 5 expressive voices, speech tags, and telephony codecs.
Input
$16.50/M
Output
—
Context
—
grok-4.20-multi-agent (beta)Multiple agents collaborate in parallel to perform deep research tasks.REASONINGTOOLSWEBAGENTS
Input
$1.38/M
Output
$2.75/M
Context
2M
grok-4.20-non-reasoning-betaGrok 4.20 Beta is the newest flagship model from xAI 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.TOOLSWEB
Input
$1.38/M
Output
$2.75/M
Context
2M

FAQ · GROK-4.5

Frequently asked

01 / 04

How do I call grok-4.5 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘xai/grok-4.5’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does grok-4.5 cost?

Input: $2.20/M per million tokens. Output: $6.60/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for grok-4.5?

grok-4.5 supports a context window of 500K tokens, with a maximum output of 500K tokens.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try grok-4.5 in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

Start free Quickstart