Is GPT-5.6 Luna or Grok 4.7 cheaper?

GPT-5.6 Luna is cheaper for a typical request of 1,000 input and 500 output tokens: $0.0008 versus $0.005 for Grok 4.7, about 84% less.

What are the per-token prices of GPT-5.6 Luna and Grok 4.7?

GPT-5.6 Luna costs $0.20 input and $1.20 output per million tokens. Grok 4.7 costs $2.00 input and $6.00 output per million tokens.

Which has the larger context window, GPT-5.6 Luna or Grok 4.7?

GPT-5.6 Luna has the larger context window: 1.05M tokens versus 500K for Grok 4.7.

OpenAI vs xAI

GPT-5.6 Luna vs Grok 4.7: pricing comparison

GPT-5.6 Luna costs 6.3× less than Grok 4.7 for a typical 1,000-input, 500-output request. Here is how the two compare on price, context and discounts.

Prices last updated: September 25, 2026

	GPT-5.6 Luna	Grok 4.7
Provider	OpenAI	xAI
Input per 1M tokens	$0.20	$2.00
Output per 1M tokens	$1.20	$6.00
Context window	1.05M	500K
Batch discount	50% off	Not offered
Typical request (1,000 in / 500 out)	$0.0008	$0.005
Monthly at 1,000 requests/day	$24.00	$150.00

GPT-5.6 Luna: Inputs above 272K tokens are billed at a higher long-context rate ($0.40 / $1.80).

Grok 4.7: Price shown is for inputs below 200K tokens.

Compare with your own numbers

Input tokens

Output tokens

Requests / day

GPT-5.6 Luna per request: $0.0008
Per month: $24.00

Grok 4.7 per request: $0.005
Per month: $150.00

Cost by task

Cost per 1,000 requests at standard prices.
Task	Tokens (in / out)	GPT-5.6 Luna	Grok 4.7
Short chat reply	500 / 300	$0.46	$2.80
RAG answer	6,000 / 600	$1.92	$15.60
Summarize a long document	12,000 / 1,000	$3.60	$30.00
Output-heavy generation	1,000 / 4,000	$5.00	$26.00

Output tokens usually dominate the bill — see input vs output token cost.

Frequently asked questions

Is GPT-5.6 Luna or Grok 4.7 cheaper?: GPT-5.6 Luna is cheaper for a typical request of 1,000 input and 500 output tokens: $0.0008 versus $0.005 for Grok 4.7, about 84% less.
What are the per-token prices of GPT-5.6 Luna and Grok 4.7?: GPT-5.6 Luna costs $0.20 input and $1.20 output per million tokens. Grok 4.7 costs $2.00 input and $6.00 output per million tokens.
Which has the larger context window, GPT-5.6 Luna or Grok 4.7?: GPT-5.6 Luna has the larger context window: 1.05M tokens versus 500K for Grok 4.7.

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