Head to head
vs o3-pro is legacy.
For light moderate heavy
No verdict
One cost is measured and the other is stale . The two bases are never ranked against each other, so no verdict is given. Each figure is shown on its own basis below.
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Verified pricing, pass rate and cost per solved task for GPT-5.6 Terra and o3-pro Figure GPT-5.6 Terra o3-pro Input $/Mtok $2 $20 Output $/Mtok $12 $80 Cached input $/Mtok $0.2 missing Pass rate 60% 85% Cost per solved task $4.50 measured $8.48 stale Cost per month $900 $1.7k
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for GPT-5.6 Terra (measured, $4.50 per solved task), o3-pro (stale, $8.48 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $100 $1k $10k $100k $1M TASKS / MONTH (log) → 200 tasks GPT-5.6 Terra · MEASURED · $4.50 per solved task $900 GPT-5.6 Terra MEASURED o3-pro · STALE · $8.48 per solved task $1.7k o3-pro STALE Monthly cost against tasks per month Log-log lines for GPT-5.6 Terra (measured, $4.50 per solved task), o3-pro (stale, $8.48 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $100 $1k $10k $100k $1M TASKS / MONTH (log) → 200 tasks GPT-5.6 Terra · MEASURED · $4.50 per solved task $900 o3-pro · STALE · $8.48 per solved task $1.7k — GPT-5.6 Terra · MEASURED — o3-pro · STALE 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