GPT-5.6 Luna vs Muse Spark 1.2

Price, context window & benchmark comparison

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GPT-5.6 Luna

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
VS
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Muse Spark 1.2

Meta
$1.25 / $4.25
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.6 Luna is 4.4× cheaper than Muse Spark 1.2 on a typical 3:1 input/output mix. Muse Spark 1.2 scores higher on the Artificial Analysis Intelligence Index (39.6 vs 37.3). GPT-5.6 Luna has the larger context window (1.1M vs 1M).
GPT-5.6 LunaMuse Spark 1.2
Input price / 1M$0.20$1.25
Output price / 1M$1.20$4.25
Blended price (3:1)$0.45$2.00
Cached input / 1M$0.02$0.15
Context window1.1M1M
Max output128K944K
Intelligence index37.339.6
Coding index71.472.2
Providers7—
Best provider uptime (30m)100.0%—
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-07-092026-08-05
Retirement——

Cost calculator

FAQ

Which is cheaper, GPT-5.6 Luna or Muse Spark 1.2?

GPT-5.6 Luna is 4.4× cheaper than Muse Spark 1.2 on a typical 3:1 input/output mix.

GPT-5.6 Luna vs Muse Spark 1.2: which has a bigger context window?

GPT-5.6 Luna: 1,050,000 tokens. Muse Spark 1.2: 1,048,576 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-5.6 Luna ≈ $1,000, Muse Spark 1.2 ≈ $4,625.

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