GPT-6 Luna Pro vs Mercury 2

Price, context window & benchmark comparison

OpenAI

GPT-6 Luna Pro

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

Mercury 2

Inception
$0.25 / $0.75
Input / Output · per 1M tokens
Compare different models
OpenAI
Inception
Verdict: GPT-6 Luna Pro is 47% cheaper than Mercury 2 on a typical 3:1 input/output mix. GPT-6 Luna Pro has the larger context window (1.1M vs 128K).
GPT-6 Luna ProMercury 2
Input price / 1M$0.10$0.25
Output price / 1M$0.50$0.75
Blended price (3:1)$0.20$0.38
Cached input / 1M$0.01$0.025
Context window1.1M128K
Max output128K50K
Intelligence index
Coding index31.1
Providers6
Best provider uptime (30m)100.0%
Vision inputYesNo
ReasoningYesYes
Tool callingYesYes
Released2026-09-222026-03-04
Retirement

Cost calculator

FAQ

Which is cheaper, GPT-6 Luna Pro or Mercury 2?

GPT-6 Luna Pro is 47% cheaper than Mercury 2 on a typical 3:1 input/output mix.

GPT-6 Luna Pro vs Mercury 2: which has a bigger context window?

GPT-6 Luna Pro: 1,050,000 tokens. Mercury 2: 128,000 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 ≈ $875.00.

More comparisons