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SOLVENCY

Head to head

GPT-5.6 Luna vs GPT-4.1

GPT-5.6 Luna: currentGPT-4.1: legacyheavy 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-4.1$2

Output $/M tokens

lower is better

  • GPT-5.6 Luna$1.2
  • GPT-4.1$8

Cost per solved task

needs a pass rate for both

  • GPT-5.6 Lunamissing
  • GPT-4.1$5.15
GPT-5.6 LunaGPT-4.1
Input $/Mtok$0.2$2
Output $/Mtok$1.2$8
Cached input $/Mtok$0.02$0.5
Pass ratemissing52%
Pass rate sourcemissingAider
Cost basismissingmodelled
Cost per solved taskmissing$5.15

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-5.6 Luna· GPT-4.1