Claude Fable 5 vs GPT-5.6 Luna: pricing, Quality, Value, and benchmarks

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Pricing, app access, and Conversation Value

• Humanity's Last Exam

  Normalized quality input

  53.3%

  Artificial Analysis Claude Fable 5 evaluation | Independent Fable 5 production-config result with adaptive reasoning, maximum effort, and safeguard fallback enabled.

• AA-Omniscience

  AA-Omniscience Index

  40.1

  Artificial Analysis AA-Omniscience evaluation | Independent Artificial Analysis result for Claude Fable 5 (Adaptive Reasoning, Max Effort, safeguard fallback enabled). Display-only; this row does not affect Quality or Value scores.

• SWE-Bench Pro

  Normalized quality input

  80.0%

  Anthropic Claude Fable 5 and Mythos 5 system card | Anthropic vendor-reported Fable 5 result averaged over five trials. Use the Fable 5 SWE-Bench Pro column, not Mythos 5 or SWE-Bench Verified.

• Terminal-Bench 2.1

  Agentic terminal task completion

  84.3%

  Anthropic Claude Fable 5 and Mythos 5 system card | Anthropic vendor-reported Fable 5 Terminal-Bench 2.1 result using mini-SWE-agent at high effort; 20.9% of trials used safeguard fallback routing.

• Humanity's Last Exam

  Normalized quality input

  37.2%

  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

  84.7%

  OpenAI GPT-5.6 announcement | OpenAI vendor-reported GPT-5.6 Luna Terminal-Bench 2.1 result. Do not substitute Sol, Terra, or another evaluation tier.

The most intelligent model in the current field, but its record capability comes with roster-leading token prices, quarter-rate token throughput, and safeguard-triggered fallback routing.

Claude Fable 5 is the most intelligent generally available model in the current field: its production configuration leads the independent Artificial Analysis Intelligence Index, while Anthropic reports 80.0% on SWE-Bench Pro and 84.3% on Terminal-Bench 2.1. Buy it selectively, not by default. At $10 per million input tokens and $50 per million output tokens, it is the most expensive model in the current PickAI roster, and its published input and output token-per-minute limits are only one quarter of the rates published for standard current Claude models. Fable can also decline classifier-flagged requests involving cybersecurity, biology or chemistry, model distillation, or frontier-AI development; supported Claude clients may then use safeguard fallback routing. Anthropic says client users are notified and API responses identify the serving model or refusal, so production integrations should surface that metadata and never assume every request was answered by Fable.

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.