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SOLVENCY

Head to head

Claude Opus 4.6 vs Claude Opus 4.5

Claude Opus 4.6: legacyClaude Opus 4.5: legacyheavy tier

Verdict · modelled basis

Claude Opus 4.6 costs 1.1x less per solved task.

On output token price alone, Claude Opus 4.5 looks 1.0x cheaper (1.0x on input). The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.

Source: Scale SEAL leaderboard, SWE-bench Pro · verified 2026-08-21 · prices from each provider's pricing page

Input $/M tokens

lower is better

  • Claude Opus 4.6$5
  • Claude Opus 4.5$5

Output $/M tokens

lower is better

  • Claude Opus 4.6$25
  • Claude Opus 4.5$25

Cost per solved task

modelled basis · lower is better

  • Claude Opus 4.6$8.67
  • Claude Opus 4.5$9.81
Claude Opus 4.6Claude Opus 4.5
Input $/Mtok$5$5
Output $/Mtok$25$25
Cached input $/Mtok$0.5$0.5
Pass rate52%46%
Pass rate sourceSEALSEAL
Cost basismodelledmodelled
Cost per solved task$8.67$9.81

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· Claude Opus 4.6· Claude Opus 4.5