How much does the Grok 4.5 API cost?

On FastMetal, Grok 4.5 is billed per token in yen: ¥357.4 per 1M input tokens and ¥1,072.2 per 1M output tokens, before tax. Usage is drawn from a prepaid balance; there is no subscription or monthly fee.

Can I call Grok 4.5 with the OpenAI SDK?

Yes. Point base_url at https://api.fastmetal.ai/v1 and pass "grok-4.5" as the model; existing OpenAI-style code works unchanged, including streaming, tool calls and structured output.

What is the context window of Grok 4.5?

500,000 tokens, shared between the prompt and the response.

What do I need to try Grok 4.5?

Create an account and add credit; the model is then available both in the browser chat and over the API. There is no contract or minimum spend.

Back to Models

x-ai/grok-4-5

Grok 4.5

Grok 4.5 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.

7/8/2026

500,000 tokens

Input: ¥357.4/M

Output: ¥1,072.2/M

Try in Chat Get API Key

Specifications

Modalities

Input

text

image

file

Output

text

Supported Parameters

frequency_penalty

include_reasoning

logprobs

max_tokens

presence_penalty

reasoning

reasoning_effort

response_format

seed

stop

structured_outputs

temperature

tool_choice

tools

top_logprobs

top_p

Reasoning Configuration

Default: Thinking on (effort: high)
Selectable effort levels: high
medium
low
Turning thinking off: Not possible (always thinks)

How to control thinking, and what it costs

Code Examples

curl https://api.fastmetal.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "grok-4.5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

How Grok 4.5 actually answers

Real responses to our standard prompts, recorded on FastMetal.

Count the number of 'r's in 'strawberry'

Count the number of 'r's in 'strawberry'. Explain your reasoning step by step.

The word "strawberry" is spelled as follows: **s-t-r-a-w-b-e-r-r-y** - Position 1: **s** - Position 2: **t** - Position 3: **r** ← (1st "r") - Position 4: **a** - Position 5: **w** - Position 6: **b** - Position 7: **e** - Position 8: **r** ← (2nd "r") - Position 9: **r** ← (3rd "r") - Position 10: **y** There are **3** occurrences of the letter "r".

6.5s response350 output tokens

Debug This Error

I'm getting the following error in my Node.js application: TypeError: Cannot read properties of undefined (reading 'map') at UserList (/app/components/UserList.js:12:25) at renderWithHooks (/app/node_modules/rea…

The error occurs because `users` is `undefined` when the component renders, so calling `.map()` on it fails. This commonly happens when: - The parent component doesn’t pass a `users` prop at all - The data is loaded asynchronously and is still `undefined` on the first render - The prop is accidentally set to `undefined`/`null` instead of an array ### Fixes **1. Default to an empty array (simplest)** ```js function UserList({ users = [] }) { return ( <ul> {users.map(user => ( <li key={user.id}>{user.name}</li> ))} </ul> ); } ``` **2. Optional chaining (also fine)** ```js function UserList({ users }) { return ( <ul> {users?.map(user => (…

7.9s response507 output tokens

Code Review

Please review the following Python function and suggest improvements for readability, performance, and best practices: def get_data(url, retries=3): import requests import time for i in range(retries):…

## Code Review: `get_data` ### Issues | Area | Problem | |------|---------| | **Imports** | `requests` / `time` inside the function — re-imported on every call; belong at module level | | **Exceptions** | Bare `except:` swallows `KeyboardInterrupt`, `SystemExit`, and hides bugs | | **Boolean check** | `item["active"] == True` is unidiomatic; truthiness is enough | | **Loop** | Manual `for` + `append` can be a list comprehension | | **Retries** | Sleeps on non-200 but never logs or distinguishes failure modes; unused loop variable `i` | | **Robustness** | No guard for non-list JSON, missing keys (`KeyError`), or invalid JSON | | **API** | Magic numbers (`timeout=10`, `sleep=2`); no docstrin…

25.3s response1363 output tokens

Compare these answers side by side with other models →

Frequently asked questions

How much does the Grok 4.5 API cost?: On FastMetal, Grok 4.5 is billed per token in yen: ¥357.4 per 1M input tokens and ¥1,072.2 per 1M output tokens, before tax. Usage is drawn from a prepaid balance; there is no subscription or monthly fee.
Can I call Grok 4.5 with the OpenAI SDK?: Yes. Point base_url at https://api.fastmetal.ai/v1 and pass "grok-4.5" as the model; existing OpenAI-style code works unchanged, including streaming, tool calls and structured output.
What is the context window of Grok 4.5?: 500,000 tokens, shared between the prompt and the response.
What do I need to try Grok 4.5?: Create an account and add credit; the model is then available both in the browser chat and over the API. There is no contract or minimum spend.