spacexai

Grok 4.5

Input / 1M: $2.1
Output / 1M: $6.3
Context: 500,000 tokens
Catalog: Gateway catalog

About this model

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

Replaces Grok 4.3: input $1.3125 → $2.1 per 1M (+60%), output $2.625 → $6.3 per 1M (+140%), context 1M → 500K, max output 1M → 500K.

text inputimage inputtext outputlanguage

Use with MiniRouter Compare this model View docs

Use an endpoint supported by this model.

Get a key for this setup →

Thinking guide →

1const response = await fetch('https://api.minirouter.sh/v1/chat/completions', {2  method: 'POST',3  headers: {4    Authorization: `Bearer ${process.env.MINIROUTER_KEY}`,5    'Content-Type': 'application/json',6  },7  body: JSON.stringify({8    model: 'spacexai/grok-4.5',9    messages: [{ role: 'user', content: 'Why is the sky blue?' }],10    max_tokens: 1024,11  }),12})13 14const data = await response.json()15console.log(data.choices[0].message.content)

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Overview

Model type: language
Context window: 500,000
Maximum output: 500,000
Input / 1M tokens: $2.1
Output / 1M tokens: $6.3
Released: 2026-07-08

Prices include the MiniRouter fee. Compatibility snapshot: 2026-08-06. Input: text, image. Output: text.

Endpoints

/v1/chat/completions/v1/messages/v1/responses

Platform-funded routing only. Caller BYOK credentials and OIDC-based upstream authentication are intentionally excluded; authenticate with a MiniRouter bearer key.

Captured parameters: max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs.

Structured output: JSON Schema and JSON mode enforced on verified providers. How it works

API

Use the setup panel above to switch between Chat Completions, Messages, and client configurations. Every snippet keeps the model ID unchanged.

Base URLhttps://api.minirouter.sh/v1

Model IDspacexai/grok-4.5

Providers

MiniRouter selects from the configured routes below. Priority is the catalog order, not a latency or availability score.

Provider	Priority	Input / 1M	Output / 1M	Parameters	Access
vercel	1	$2.1	$6.3	max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs	MiniRouter balance