GPT-5.6 Luna Pro vs Grok 4.5

Price, context window & benchmark comparison

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GPT-5.6 Luna Pro

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
VS
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Grok 4.5

xAI
$2.00 / $6.00
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.6 Luna Pro is 6.7× cheaper than Grok 4.5 on a typical 3:1 input/output mix. GPT-5.6 Luna Pro has the larger context window (1.1M vs 500K).
GPT-5.6 Luna ProGrok 4.5
Input price / 1M$0.20$2.00
Output price / 1M$1.20$6.00
Blended price (3:1)$0.45$3.00
Cached input / 1M$0.02$0.30
Context window1.1M500K
Max output128K450K
Intelligence index38.8
Coding index72.4
Providers54
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-07-092026-07-08
Retirement

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FAQ

Which is cheaper, GPT-5.6 Luna Pro or Grok 4.5?

GPT-5.6 Luna Pro is 6.7× cheaper than Grok 4.5 on a typical 3:1 input/output mix.

GPT-5.6 Luna Pro vs Grok 4.5: which has a bigger context window?

GPT-5.6 Luna Pro: 1,050,000 tokens. Grok 4.5: 500,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-5.6 Luna Pro ≈ $1,000, Grok 4.5 ≈ $7,000.

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