SpaceXAI: Grok 4.5

SpaceXAI: Grok 4.5 is a large language model from xAI. It costs $2.00 per million input tokens and $6.00 per million output tokens. Its context window is 500K tokens.

ReasoningTool callingStructured outputPrompt cachingimage inputfile input

Input / 1M tokens: $2.00
Output / 1M tokens: $6.00
Cached input / 1M: $0.300
Context window: 500K

This model also charges $0.005 per search request

That is $5.00 per 1,000 requests, billed on top of the token prices above. On a typical 1,000-in / 500-out exchange the tokens cost $0.005, so the search fee is about the same the token cost. Per-token rankings elsewhere ignore this entirely.

Who serves it cheapest

1 hosts serve Grok 4.5. Same weights, same API - the price difference is pure margin and routing.

Providers serving SpaceXAI: Grok 4.5, cheapest first
Provider	Input / 1M	Output / 1M	Context	Throughput	Uptime 24h
xAICheapest	$2.00	$6.00	500K	-	99.5%

Benchmarks

Independent scores published alongside the catalogue.

Intelligence index: 39.1
Coding index: 72.4
Agentic index: 42.1

About Grok 4.5

Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.

Specifications

SpaceXAI: Grok 4.5 specifications
Model ID	`x-ai/grok-4.5`
Provider	xAI
Context window	500K tokens
Max output	450K tokens
Input modalities	text, image, file
Output modalities	text
Knowledge cutoff	-
Open weights	No
Released	July 8, 2026

Cheaper alternatives

Models that cost less than Grok 4.5 while keeping at least half its context window and every input modality it supports.

GPT-5 Image Mini

$2.50 in · $2.00 out

1.3× cheaper

Muse Spark 1.3

$1.25 in · $4.25 out

1.5× cheaper

Muse Spark 1.2

$1.25 in · $4.25 out

1.5× cheaper

Muse Spark 1.1

$1.25 in · $4.25 out

1.5× cheaper

Sakana Namazu

$0.950 in · $4.00 out

1.8× cheaper

Frequently asked

How much does SpaceXAI: Grok 4.5 cost?

$2.00 per million input tokens and $6.00 per million output tokens. Cached input reads cost $0.300 per million tokens.

What is the context window of SpaceXAI: Grok 4.5?

500K tokens, with up to 450K tokens of output per request.

Does SpaceXAI: Grok 4.5 have extra fees beyond per-token pricing?

Yes. SpaceXAI: Grok 4.5 charges $0.005 per search request - $5.00 per 1,000 requests - on top of $2.00 per million input tokens and $6.00 per million output tokens. On a typical 1,000-input / 500-output exchange the search fee alone is about the same the token cost.

Confirm against the source: xAI official pricing.