GPT-5.4 Nano vs GPT-5.6 Luna

Price, context window & benchmark comparison

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GPT-5.4 Nano

OpenAI
$0.20 / $1.25
Input / Output · per 1M tokens
VS
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GPT-5.6 Luna

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.6 Luna is 3% cheaper than GPT-5.4 Nano on a typical 3:1 input/output mix. GPT-5.6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 20.7). GPT-5.6 Luna has the larger context window (1.1M vs 400K).
GPT-5.4 NanoGPT-5.6 Luna
Input price / 1M$0.20$0.20
Output price / 1M$1.25$1.20
Blended price (3:1)$0.46$0.45
Cached input / 1M$0.02$0.02
Context window400K1.1M
Max output128K128K
Intelligence index20.737.3
Coding index56.171.4
Providers7
Best provider uptime (30m)100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-03-172026-07-09
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FAQ

Which is cheaper, GPT-5.4 Nano or GPT-5.6 Luna?

GPT-5.6 Luna is 3% cheaper than GPT-5.4 Nano on a typical 3:1 input/output mix.

GPT-5.4 Nano vs GPT-5.6 Luna: which has a bigger context window?

GPT-5.4 Nano: 400,000 tokens. GPT-5.6 Luna: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-5.4 Nano ≈ $1,025, GPT-5.6 Luna ≈ $1,000.

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