GPT-5.6 Luna vs GPT-5.6 Sol: pricing, Quality, Value, and benchmarks

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Pricing, app access, and Conversation Value

• Humanity's Last Exam

  Normalized quality input

  39.5%

  Artificial Analysis GPT-5.6 Luna max analysis page | Independent Artificial Analysis HLE result for the max-reasoning model variant. Treat as tier-3 provisional evidence and do not describe it as OpenAI-published no-tools HLE.

• AA-Omniscience

  AA-Omniscience Index

  -11.2

  Artificial Analysis AA-Omniscience evaluation | Independent Artificial Analysis result for GPT-5.6 Luna (max). Display-only; this row does not affect Quality or Value scores.

• SWE-Bench Pro

  Normalized quality input

  62.7%

  OpenAI GPT-5.6 release | OpenAI official GPT-5.6 launch table. Results are vendor-reported and must retain the named model tier, reasoning setting, benchmark version, and harness caveats.

• Terminal-Bench 2.1

  Agentic terminal task completion

The fastest, lowest-cost GPT-5.6 option for high-volume workloads.

GPT-5.6 Luna is the fastest and lowest-cost tier in the family. Its accepted HLE and SWE-Bench Pro evidence keep it competitive for high-volume workflows, while difficult tasks should still be tested against Terra or Sol.

OpenAI’s flagship for complex professional work and coding, at premium API pricing.

GPT-5.6 Sol is OpenAI’s flagship tier for complex coding and professional work. Its strong independent HLE and official SWE-Bench Pro evidence come with the family’s highest API price, so it is best reserved for work that justifies maximum capability.