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SOLVENCY

Head to head

Claude Opus 4 vs Claude Opus 4.5

Claude Opus 4: retiredClaude Opus 4.5: legacyheavy tier

No verdict

One cost is measured by its benchmark and the other is modelled by Solvency. The two bases are never ranked against each other, so no verdict is given here.

Source: Aider polyglot benchmark · verified 2026-08-21 · prices from each provider's pricing page

Input $/M tokens

lower is better

  • Claude Opus 4$15
  • Claude Opus 4.5$5

Output $/M tokens

lower is better

  • Claude Opus 4$75
  • Claude Opus 4.5$25

Cost per solved task

different bases — not comparable

  • Claude Opus 4$18.75
  • Claude Opus 4.5$9.81
Claude Opus 4Claude Opus 4.5
Input $/Mtok$15$5
Output $/Mtok$75$25
Cached input $/Mtok$1.5$0.5
Pass rate72%46%
Pass rate sourceAiderSEAL
Cost basismodelledmodelled
Cost per solved task$18.75$9.81

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· Claude Opus 4· Claude Opus 4.5