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Head to head

GPT-5.6 TerravsGrok 4.5

For tasks, about a month.

Verdict · measured basis

Grok 4.5 costs $3.81 per solved task against GPT-5.6 Terra at $4.50 — ▼ 1.2x cheaper. Over 200 tasks that is $138 a month.

On output token price alone Grok 4.5 looks 2.0x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5.6 Terra and Grok 4.5
FigureGPT-5.6 TerraGrok 4.5
Input $/Mtok$2$2
Output $/Mtok$12$6
Cached input $/Mtok$0.2$0.3
Pass rate60%64%
Cost per solved task$4.50measured$3.81measured
Cost per month$900$763

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Grok 4.5 (measured, $3.81 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 tasksGrok 4.5 · MEASURED · $3.81 per solved task$763GPT-5.6 Terra · MEASURED · $4.50 per solved task$900— Grok 4.5 · 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