OpenAI Launches GPT-5.6 Series: Sol, Terra, and Luna Models Now Publicly Available

OpenAI has publicly released its highly anticipated GPT-5.6 series, featuring three tiers—Sol, Terra, and Luna—after a brief delay for government safety reviews, marking a significant advancement in AI capabilities for various applications.

The top 3

  1. Reasoning & Problem Solving: GPT-5.6 Sol, the flagship model, achieves high scores on reasoning benchmarks like ARC-AGI-3, demonstrating enhanced planning and problem-solving in unfamiliar environments.
  2. Multilingual Capability: The GPT-5.6 series significantly advances multilingual understanding, with models evaluated on benchmarks such as MMLU-ProX across numerous languages.
  3. Coding Proficiency Rankings: GPT-5.6 Sol shows strong performance in coding tasks, excelling in long-horizon coding and multi-step agentic workflows, and is a top contender on benchmarks like Terminal-Bench 2.1.

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