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Head to head

GPT-5.6 LunavsMuse Spark 1.2

For tasks, about a month.

Verdict · measured basis

GPT-5.6 Luna costs $2.65 per solved task against Muse Spark 1.2 at $3.34 — ▼ 1.3x cheaper. Over 200 tasks that is $138 a month.

On output token price alone GPT-5.6 Luna looks 3.5x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5.6 Luna and Muse Spark 1.2
FigureGPT-5.6 LunaMuse Spark 1.2
Input $/Mtok$0.2$1.25
Output $/Mtok$1.2$4.25
Cached input $/Mtok$0.02$0.15
Pass rate57%62%
Cost per solved task$2.65measured$3.34measured
Cost per month$530$668

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for GPT-5.6 Luna (measured, $2.65 per solved task), Muse Spark 1.2 (measured, $3.34 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$100$1k$10k$100kTASKS / MONTH (log) →200 tasksGPT-5.6 Luna · MEASURED · $2.65 per solved task$530Muse Spark 1.2 · MEASURED · $3.34 per solved task$668— GPT-5.6 Luna · MEASURED— Muse Spark 1.2 · MEASURED

Solid measured · dashed modeled · dotted stale. The gap is the verdict.

Source: Artificial Analysis (artificialanalysis.ai) · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings