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SOLVENCY

Head to head

o3 vs Claude Sonnet 4

o3 is legacy; Claude Sonnet 4 is retired.

For tasks, about a month.

Verdict · stale basis

o3 costs $0.89 per solved task against Claude Sonnet 4 at $1.96 — ▼ 2.2x cheaper. Over 200 tasks that is $214 a month.

On output token price alone o3 looks 1.9x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for o3 and Claude Sonnet 4
Figureo3Claude Sonnet 4
Input $/Mtok$2$3
Output $/Mtok$8$15
Cached input $/Mtok$0.5$0.3
Pass rate81%61%
Cost per solved task$0.89stale$1.96stale
Cost per month$177$392

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for o3 (stale, $0.89 per solved task), Claude Sonnet 4 (stale, $1.96 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$10$100$1k$10k$100kTASKS / MONTH (log) →200 taskso3 · STALE · $0.89 per solved task$177Claude Sonnet 4 · STALE · $1.96 per solved task$392— o3 · STALE— Claude Sonnet 4 · STALE

Solid measured · dashed modelled · dotted stale. The gap is the verdict.

Source: Aider polyglot benchmark · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings