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SOLVENCY

Head to head

o3-pro vs Claude Sonnet 4

o3-pro is legacy; Claude Sonnet 4 is retired.

For tasks, about a month.

Verdict · stale basis

Claude Sonnet 4 costs $1.96 per solved task against o3-pro at $8.48 — ▼ 4.3x cheaper. Over 200 tasks that is $1.3k a month.

On output token price alone Claude Sonnet 4 looks 5.3x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for o3-pro and Claude Sonnet 4
Figureo3-proClaude Sonnet 4
Input $/Mtok$20$3
Output $/Mtok$80$15
Cached input $/Mtokmissing$0.3
Pass rate85%61%
Cost per solved task$8.48stale$1.96stale
Cost per month$1.7k$392

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Claude Sonnet 4 (stale, $1.96 per solved task), o3-pro (stale, $8.48 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$100$1k$10k$100k$1MTASKS / MONTH (log) →200 tasksClaude Sonnet 4 · STALE · $1.96 per solved task$392o3-pro · STALE · $8.48 per solved task$1.7k— Claude Sonnet 4 · STALE— o3-pro · 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