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Head to head

GPT-5.6 TerravsGPT-5.6 Luna

For tasks, about a month.

Verdict · measured basis

GPT-5.6 Luna costs $2.65 per solved task against GPT-5.6 Terra at $4.50 — ▼ 1.7x cheaper. Over 200 tasks that is $370 a month.

On output token price alone GPT-5.6 Luna looks 10x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5.6 Terra and GPT-5.6 Luna
FigureGPT-5.6 TerraGPT-5.6 Luna
Input $/Mtok$2$0.2
Output $/Mtok$12$1.2
Cached input $/Mtok$0.2$0.02
Pass rate60%57%
Cost per solved task$4.50measured$2.65measured
Cost per month$900$530

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), GPT-5.6 Terra (measured, $4.50 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$530GPT-5.6 Terra · MEASURED · $4.50 per solved task$900— GPT-5.6 Luna · MEASURED— GPT-5.6 Terra · 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