GPT-6 Luna vs Grok 4.20 Multi-Agent

Price, context window & benchmark comparison

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GPT-6 Luna

OpenAI
$0.10 / $0.50
Input / Output · per 1M tokens
VS
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Grok 4.20 Multi-Agent

xAI
$1.25 / $2.50
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-6 Luna is 7.8× cheaper than Grok 4.20 Multi-Agent on a typical 3:1 input/output mix. Grok 4.20 Multi-Agent has the larger context window (2M vs 1.1M).
GPT-6 LunaGrok 4.20 Multi-Agent
Input price / 1M$0.10$1.25
Output price / 1M$0.50$2.50
Blended price (3:1)$0.20$1.56
Cached input / 1M$0.01$0.20
Context window1.1M2M
Max output128K1.8M
Intelligence index37.3—
Coding index——
Providers7—
Best provider uptime (30m)100.0%—
Vision inputYesYes
ReasoningYesYes
Tool callingYesNo
Released2026-09-222026-03-31
Retirement——

Cost calculator

FAQ

Which is cheaper, GPT-6 Luna or Grok 4.20 Multi-Agent?

GPT-6 Luna is 7.8× cheaper than Grok 4.20 Multi-Agent on a typical 3:1 input/output mix.

GPT-6 Luna vs Grok 4.20 Multi-Agent: which has a bigger context window?

GPT-6 Luna: 1,050,000 tokens. Grok 4.20 Multi-Agent: 2,000,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-6 Luna ≈ $450.00, Grok 4.20 Multi-Agent ≈ $3,750.

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