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SOLVENCY

Head to head

GPT-5.6 Sol vs DeepSeek V4 Flash

For tasks, about a month.

Verdict · measured basis

DeepSeek V4 Flash costs $0.12 per solved task against GPT-5.6 Sol at $9.88 — ▼ 82x cheaper. Over 200 tasks that is $2.0k a month.

On output token price alone DeepSeek V4 Flash looks 23x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5.6 Sol and DeepSeek V4 Flash
FigureGPT-5.6 SolDeepSeek V4 Flash
Input $/Mtok$5$0.44
Output $/Mtok$30$1.32
Cached input $/Mtok$0.5$0.014
Pass rate65%50%
Cost per solved task$9.88measured$0.12measured
Cost per month$2.0k$24

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for DeepSeek V4 Flash (measured, $0.12 per solved task), GPT-5.6 Sol (measured, $9.88 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$1$10$100$1k$10k$100k$1MTASKS / MONTH (log) →200 tasksDeepSeek V4 Flash · MEASURED · $0.12 per solved task$24GPT-5.6 Sol · MEASURED · $9.88 per solved task$2.0k— DeepSeek V4 Flash · MEASURED— GPT-5.6 Sol · MEASURED

Solid measured · dashed modelled · 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