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xAI: Grok 4.5

grok-4.5

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Grok 4.5 costs $2.60 per million input tokens and $7.80 per million output tokens, supports 500K context, and is available through the OpenAI-compatible API.

Grok 4.5 is SpaceXAI's frontier reasoning model for coding, knowledge work, and STEM. It supports text, image, and file inputs with tool calling and structured outputs. Reasoning is always active. Content policy rejections can still be charged: SpaceXAI may pass through a $0.05 moderation-failure fee, or a $0.055 usage-guidelines violation fee, depending on which rejection upstream returns.

Modalities

Text + Image → Text

Input / output price

$2.60 / $7.80 per 1M

Context

500K

Capabilities

ReasoningVisionTool callingLong context

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$2.60
Output$7.80
Cached input$0.390

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.0140
Per day
$7.02
Per month (30 days)
$210.60

Grok 4.5: input $2.6/M · output $7.8/M · cached input $0.39/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "grok-4.5", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to grok-4.5.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-4.5",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is Grok 4.5 billed?
Input is $2.60 and output is $7.80 per million tokens; cached input is $0.390. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
500K tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
Grok 4.5 API pricing · GeniusRelay