Head to head
vs o3 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 Claude Opus 5 and o3 Figure Claude Opus 5 o3 Input $/Mtok $5 $2 Output $/Mtok $25 $8 Cached input $/Mtok $0.5 $0.5 Pass rate 100% 81% Cost per solved task $0.10 measured $0.89 stale Cost per month $19 $177
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for Claude Opus 5 (measured, $0.10 per solved task), o3 (stale, $0.89 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $1 $10 $100 $1k $10k $100k TASKS / MONTH (log) → 200 tasks Claude Opus 5 · MEASURED · $0.10 per solved task $19 Claude Opus 5 MEASURED o3 · STALE · $0.89 per solved task $177 o3 STALE Monthly cost against tasks per month Log-log lines for Claude Opus 5 (measured, $0.10 per solved task), o3 (stale, $0.89 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $1 $10 $100 $1k $10k $100k TASKS / MONTH (log) → 200 tasks Claude Opus 5 · MEASURED · $0.10 per solved task $19 o3 · STALE · $0.89 per solved task $177 — Claude Opus 5 · MEASURED — o3 · STALE Solid measured · dashed modeled · dotted stale. The gap is the verdict.
Solvency Bench (solvency.dev) — first-party measurement · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings