Head to head
vs For light moderate heavy
Verdict · measured basis
DeepSeek V4 Pro costs $0.21 per solved task against
GPT-5.6 Luna at $2.65 — ▼ 13x cheaper .
Over 200 tasks that is $488 a month.
On output token price alone GPT-5.6 Luna looks 3.3x cheaper. The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.
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Verified pricing, pass rate and cost per solved task for GPT-5.6 Luna and DeepSeek V4 Pro Figure GPT-5.6 Luna DeepSeek V4 Pro Input $/Mtok $0.2 $1.32 Output $/Mtok $1.2 $3.96 Cached input $/Mtok $0.02 $0.044 Pass rate 57% 43% Cost per solved task $2.65 measured $0.21 measured Cost per month $530 $42
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for DeepSeek V4 Pro (measured, $0.21 per solved task), GPT-5.6 Luna (measured, $2.65 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $10 $100 $1k $10k $100k TASKS / MONTH (log) → 200 tasks DeepSeek V4 Pro · MEASURED · $0.21 per solved task $42 DeepSeek V4 Pro MEASURED GPT-5.6 Luna · MEASURED · $2.65 per solved task $530 GPT-5.6 Luna MEASURED Monthly cost against tasks per month Log-log lines for DeepSeek V4 Pro (measured, $0.21 per solved task), GPT-5.6 Luna (measured, $2.65 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $10 $100 $1k $10k $100k TASKS / MONTH (log) → 200 tasks DeepSeek V4 Pro · MEASURED · $0.21 per solved task $42 GPT-5.6 Luna · MEASURED · $2.65 per solved task $530 — DeepSeek V4 Pro · MEASURED — GPT-5.6 Luna · 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