GPT-6 Luna Pro vs Mercury 2.5

Price, context window & benchmark comparison

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GPT-6 Luna Pro

OpenAI
$0.10 / $0.50
Input / Output · per 1M tokens
VS
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Mercury 2.5

Inception
$0.04 / $0.15
Input / Output · per 1M tokens
Compare different models
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Verdict: Mercury 2.5 is 3.0× cheaper than GPT-6 Luna Pro on a typical 3:1 input/output mix. GPT-6 Luna Pro has the larger context window (1.1M vs 260K).
GPT-6 Luna ProMercury 2.5
Input price / 1M$0.10$0.04
Output price / 1M$0.50$0.15
Blended price (3:1)$0.20$0.0675
Cached input / 1M$0.01$0.004
Context window1.1M260K
Max output128K66K
Intelligence index
Coding index
Providers6
Best provider uptime (30m)100.0%
Vision inputYesNo
ReasoningYesYes
Tool callingYesYes
Released2026-09-222026-09-08
Retirement

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FAQ

Which is cheaper, GPT-6 Luna Pro or Mercury 2.5?

Mercury 2.5 is 3.0× cheaper than GPT-6 Luna Pro on a typical 3:1 input/output mix.

GPT-6 Luna Pro vs Mercury 2.5: which has a bigger context window?

GPT-6 Luna Pro: 1,050,000 tokens. Mercury 2.5: 260,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-6 Luna Pro ≈ $450.00, Mercury 2.5 ≈ $155.00.

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