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SOLVENCY

Head to head

Claude Sonnet 4 vs GPT-5.4

Claude Sonnet 4: retiredGPT-5.4: currentheavy 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 Sonnet 4$3
  • GPT-5.4$2.5

Output $/M tokens

lower is better

  • Claude Sonnet 4$15
  • GPT-5.4$15

Cost per solved task

different bases — not comparable

  • Claude Sonnet 4$4.40
  • GPT-5.4$4.19
Claude Sonnet 4GPT-5.4
Input $/Mtok$3$2.5
Output $/Mtok$15$15
Cached input $/Mtok$0.3$0.25
Pass rate61%59%
Pass rate sourceAiderSEAL
Cost basismodelledmodelled
Cost per solved task$4.40$4.19

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· Claude Sonnet 4· GPT-5.4