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Head to head

GPT-5.6 TerravsDeepSeek V4 Pro

For tasks, about a month.

Verdict · measured basis

DeepSeek V4 Pro costs $0.21 per solved task against GPT-5.6 Terra at $4.50 — ▼ 22x cheaper. Over 200 tasks that is $858 a month.

On output token price alone DeepSeek V4 Pro looks 3.0x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5.6 Terra and DeepSeek V4 Pro
FigureGPT-5.6 TerraDeepSeek V4 Pro
Input $/Mtok$2$1.32
Output $/Mtok$12$3.96
Cached input $/Mtok$0.2$0.044
Pass rate60%43%
Cost per solved task$4.50measured$0.21measured
Cost per month$900$42

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for DeepSeek V4 Pro (measured, $0.21 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$10$100$1k$10k$100kTASKS / MONTH (log) →200 tasksDeepSeek V4 Pro · MEASURED · $0.21 per solved task$42GPT-5.6 Terra · MEASURED · $4.50 per solved task$900— DeepSeek V4 Pro · 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