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SOLVENCY

Head to head

GPT-5.4 vs Claude Opus 4.5

GPT-5.4: currentClaude Opus 4.5: legacyheavy tier

Verdict · modelled basis

GPT-5.4 costs 2.3x less per solved task.

On output token price alone, GPT-5.4 looks 1.7x cheaper (2.0x on input). The ranking holds, but the margin changes.

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

Input $/M tokens

lower is better

  • GPT-5.4$2.5
  • Claude Opus 4.5$5

Output $/M tokens

lower is better

  • GPT-5.4$15
  • Claude Opus 4.5$25

Cost per solved task

modelled basis · lower is better

  • GPT-5.4$4.19
  • Claude Opus 4.5$9.81
GPT-5.4Claude Opus 4.5
Input $/Mtok$2.5$5
Output $/Mtok$15$25
Cached input $/Mtok$0.25$0.5
Pass rate59%46%
Pass rate sourceSEALSEAL
Cost basismodelledmodelled
Cost per solved task$4.19$9.81

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-5.4· Claude Opus 4.5