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SOLVENCY

Head to head

GPT-5.6 Luna vs GPT-5.4

GPT-5.6 Luna: currentGPT-5.4: currentheavy tier

No verdict

Cost per solved task needs a published pass rate for both models. At least one has none, so it is reported as missing rather than estimated.

verified 2026-08-21 · prices from each provider's pricing page

Input $/M tokens

lower is better

  • GPT-5.6 Luna$0.2
  • GPT-5.4$2.5

Output $/M tokens

lower is better

  • GPT-5.6 Luna$1.2
  • GPT-5.4$15

Cost per solved task

needs a pass rate for both

  • GPT-5.6 Lunamissing
  • GPT-5.4$4.19
GPT-5.6 LunaGPT-5.4
Input $/Mtok$0.2$2.5
Output $/Mtok$1.2$15
Cached input $/Mtok$0.02$0.25
Pass ratemissing59%
Pass rate sourcemissingSEAL
Cost basismissingmodelled
Cost per solved taskmissing$4.19

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-5.6 Luna· GPT-5.4