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SOLVENCY

Head to head

GPT-5.6 Luna vs Claude Fable 5

GPT-5.6 Luna: currentClaude Fable 5: 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
  • Claude Fable 5$10

Output $/M tokens

lower is better

  • GPT-5.6 Luna$1.2
  • Claude Fable 5$50

Cost per solved task

needs a pass rate for both

  • GPT-5.6 Lunamissing
  • Claude Fable 5$17.46
GPT-5.6 LunaClaude Fable 5
Input $/Mtok$0.2$10
Output $/Mtok$1.2$50
Cached input $/Mtok$0.02$1
Pass ratemissing67%
Pass rate sourcemissingAA
Cost basismissingmeasured
Cost per solved taskmissing$17.46

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-5.6 Luna· Claude Fable 5