Head to head
o3 vs o3-pro
o3: legacyo3-pro: legacyheavy tier
Verdict · modelled basis
o3 costs 9.6x less per solved task.
On output token price alone, o3 looks 10x cheaper (10x on input). The ranking holds, but the margin changes.
Source: Aider polyglot benchmark · verified 2026-08-21 · prices from each provider's pricing page
Input $/M tokens
lower is better
Output $/M tokens
lower is better
Cost per solved task
modelled basis · lower is better
verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· o3· o3-pro