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OpenAI: GPT-5.6 Luna Pro

Openaitext
9.6 / 10 Overall Rating

GPT-5.6 Luna Pro is OpenAI's reasoning-focused variant of the Luna architecture, configured with extended pro-mode inference for complex technical tasks. It features a 1.05M token context window and 128K maximum output limit at $0.20 per million input tokens and $1.20 per million output tokens. It accepts text, image, and file inputs, undercutting GPT-4o and Claude 3.5 Sonnet on both cost and context capacity.

Context Window
1050K
Knowledge Cutoff
2025
Max Output
16K
License
Proprietary

Where it Excels (Pros)

  • 1.05M token context window
  • Extremely low API costs
  • 128K maximum output tokens
  • Enhanced pro-mode reasoning depth

Limitations (Cons)

  • Higher latency in pro mode
  • Text-only output generation

Benchmark Breakdown

Reasoning (MMLU)94%
Coding (HumanEval)92%
Mathematics (MATH)90%
Long-Context Retrieval95%

Pricing Matrix

Input cost / 1M tokens$0.20
Output cost / 1M tokens$1.20
Visit OpenAI: GPT-5.6 Luna Pro website↗

Compare OpenAI: GPT-5.6 Luna Pro with other frontier models:

vs Meta: Muse Spark 1.2 Contributor→vs DeepSeek: DeepSeek V4 Flash Vision Exp→vs Tencent: Hy-MT2-1.8B→

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