Grok 4.5 API — pricing, playground & code

Name: Grok 4.5 API
Brand: xAI

Overview

About Grok 4.5

The previous flagship, same rate card. Every model on CompanyFabric shares the same API key, billing balance, and rate-limit envelope — one integration covers the entire library.

Facts

At a glance

Availability

Live

Pricing

$2/Mtok in

Metered exactly per call

Context window

500k tokens

Commercial use

See license

Commercial output use permitted per xAI terms.

Variants

All endpoints

Grok 4.6

$2/Mtok in

xAI's flagship, half-million-token context.

Chat Completions

Grok 4.5

$2/Mtok in

The previous flagship, same rate card.

Chat Completions

Grok 4.3

$1.25/Mtok in

Million-token context at roughly half the flagship rate.

Chat Completions

Quickstart

How to use the Grok 4.5 API

1
Create a free CompanyFabric account — starter credits are included, no card required.
2
Copy your API key from the dashboard. One key covers every model in the library.
3
Point any OpenAI SDK at api.companyfabric.com/v1 and set model to "xai/grok-4-5".
4
Read the exact metered cost of the call from the response — the same number shown in the playground.

Use cases

What teams build with it

Agents & copilots

Drive agent loops, tool calls, and user-facing assistants over the OpenAI-compatible endpoint.

agentstool useassistants

Content pipelines

Summarization, rewriting, and structured generation at metered per-token cost.

contentsummarization

Extraction & classification

Turn unstructured input into typed JSON with schema-constrained output.

extractionjson mode

Get better output

Prompting tips

State the output format before the task — models follow contracts declared early.
Few-shot beats description: two worked examples outperform a paragraph of rules.
Cap output length explicitly when cost matters; output tokens dominate most bills.

Exact, metered, prepaid

Grok 4.5 pricing

Grok 4.5 pricing is per token: $2 / M input · $6 / M output. Output tokens cost 3× input tokens, so long generations — not long prompts — are what actually drive most bills. A typical call with a 2k-token prompt and a 1k-token answer costs about $0.0100.

Every call is metered exactly and attributed to your key — the dashboard, the API usage response, and your invoice all read from the same ledger row. Cap any key's monthly spend with a budget cap, and bring your own provider key (BYOK) at 0% platform fee if you already have a direct contract.

Endpoint	Type	Price
Grok 4.6	Chat	$2 / M input · $6 / M output
Grok 4.5	Chat	$2 / M input · $6 / M output
Grok 4.3	Chat	$1.25 / M input · $2.5 / M output

Starter credits

Use Grok 4.5 free

Your CompanyFabric starter credits cover your first Grok 4.5 calls at no cost — create a free account, no card required, and the credits apply to Grok 4.5 and every other model on the key. When they run out, prepaid credits or BYOK (0% fee) take over with no plan to pick.

All ways to use AI models free →

Production-grade

Code samples

import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://api.companyfabric.com/v1",
  apiKey: process.env.COMPANYFABRIC_API_KEY,
})

const res = await client.chat.completions.create({
  model: "xai/grok-4-5",
  max_tokens: 1024,
  temperature: 0.7,
  messages: [{ role: "user", content: "Say hello from the fabric." }],
})

console.log(res.choices[0].message.content)

Playground

Try it in the browser

Playground$2 in / $6 out per 1M tokens

Model

Max output

Prompt

Comparisons

Grok 4.5 vs the alternatives

Grok 4.5 vs Claude Sonnet 4.5

Grok 4.5 and Claude Sonnet 4.5 compete for the same text workloads. Both run behind the same CompanyFabric key at exact metered prices — A/B them on your real prompts and let the outputs decide, then switch with a one-line change.

Grok 4.5 vs GPT-5.5

Grok 4.5 and GPT-5.5 compete for the same text workloads. Both run behind the same CompanyFabric key at exact metered prices — A/B them on your real prompts and let the outputs decide, then switch with a one-line change.

FAQ

Frequently asked questions

How much does the Grok 4.5 API cost?

$2 / M input · $6 / M output. Every call is metered exactly and shown before you run it.

How do I get a Grok 4.5 API key?

Create a CompanyFabric account, and one key unlocks Grok 4.5 and every other model in the library. Free starter credits are included — no subscription, no card required to try it.

Why use Grok 4.5 on CompanyFabric instead of going direct?

One key, one prepaid balance, and one rate-limit envelope across the whole library, at pricing at parity with or below the direct API. Model switching is a one-line change, and BYOK routing is 0% fee.

Is the API OpenAI-compatible?

Yes — point any OpenAI SDK at api.companyfabric.com/v1 and set model to "xai/grok-4-5".

Can I use the output commercially?

Commercial output use permitted per xAI terms.

How does billing work?

Prepaid credits via card, or BYOK with your own provider keys at 0% platform fee. No subscription required; balances never expire.

Provider

About xAI

xAI publishes the grok family. Also in this family: Grok 4.6, Grok 4.3. License: Commercial output use permitted per xAI terms.

Explore

Related model APIs

Claude Sonnet 4.5

$3/Mtok in

Anthropic

Frontier-quality text and reasoning through one OpenAI-compatible endpoint.

text

Claude Haiku 4.5

$1/Mtok in

Anthropic

Fast, cheap frontier-family model for high-volume tasks.

text

Claude Opus 4.6

$5/Mtok in

Anthropic

The frontier tier for the hardest reasoning and agentic work.

text

GPT-5.5

$5/Mtok in

OpenAI

OpenAI's flagship, one key away.

text

Gemini 3.7 Flash

$0.75/Mtok in

Google

Google's current fast model, million-token context.

text

Gemini 3.5 Flash

$1.5/Mtok in

Google

The previous stable Flash, still current for most work.

text

Browse all models A–Z →

One key. Every model. Exact prices.

Run Grok 4.5 with free starter credits. Free starter credits included — no subscription required.

Get your API key Browse all models