GPT-5.6 Luna Pro vs Grok Build 0.1

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
X

Grok Build 0.1

xAI
$1.00 / $2.00
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.6 Luna Pro is 2.8× cheaper than Grok Build 0.1 on a typical 3:1 input/output mix. GPT-5.6 Luna Pro has the larger context window (1.1M vs 256K).
GPT-5.6 Luna ProGrok Build 0.1
Input price / 1M$0.20$1.00
Output price / 1M$1.20$2.00
Blended price (3:1)$0.45$1.25
Cached input / 1M$0.02$0.20
Context window1.1M256K
Max output128K230K
Intelligence index——
Coding index—51.5
Providers54
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-07-092026-05-20
Retirement——

Cost calculator

FAQ

Which is cheaper, GPT-5.6 Luna Pro or Grok Build 0.1?

GPT-5.6 Luna Pro is 2.8× cheaper than Grok Build 0.1 on a typical 3:1 input/output mix.

GPT-5.6 Luna Pro vs Grok Build 0.1: which has a bigger context window?

GPT-5.6 Luna Pro: 1,050,000 tokens. Grok Build 0.1: 256,000 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 Build 0.1 ≈ $3,000.

More comparisons

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