Gemini 2.5 Pro vs GPT-6 Luna

Price, context window & benchmark comparison

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Gemini 2.5 Pro

Google
$1.25 / $10.00
Input / Output · per 1M tokens
VS
O

GPT-6 Luna

OpenAI
$0.10 / $0.50
Input / Output · per 1M tokens
Compare different models
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O
Verdict: GPT-6 Luna is 17.2× cheaper than Gemini 2.5 Pro on a typical 3:1 input/output mix. GPT-6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 16.1). GPT-6 Luna has the larger context window (1.1M vs 1M).
Gemini 2.5 ProGPT-6 Luna
Input price / 1M$1.25$0.10
Output price / 1M$10.00$0.50
Blended price (3:1)$3.44$0.20
Cached input / 1M$0.13$0.01
Context window1M1.1M
Max output66K128K
Intelligence index16.137.3
Coding index33.3—
Providers—7
Best provider uptime (30m)—100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2025-06-172026-09-22
Retirement2026-10-20—

Cost calculator

FAQ

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

GPT-6 Luna is 17.2× cheaper than Gemini 2.5 Pro on a typical 3:1 input/output mix.

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

Gemini 2.5 Pro: 1,048,576 tokens. GPT-6 Luna: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Gemini 2.5 Pro ≈ $7,500, GPT-6 Luna ≈ $450.00.

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