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SOLVENCY

Head to head

GPT-5 vs Claude Opus 4

GPT-5: legacyClaude Opus 4: retiredheavy tier

Verdict · modelled basis

GPT-5 costs 11x less per solved task.

On output token price alone, GPT-5 looks 7.5x cheaper (12x 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

  • GPT-5$1.25
  • Claude Opus 4$15

Output $/M tokens

lower is better

  • GPT-5$10
  • Claude Opus 4$75

Cost per solved task

modelled basis · lower is better

  • GPT-5$1.66
  • Claude Opus 4$18.75
GPT-5Claude Opus 4
Input $/Mtok$1.25$15
Output $/Mtok$10$75
Cached input $/Mtok$0.125$1.5
Pass rate88%72%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$1.66$18.75

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-5· Claude Opus 4