GPT-5.6 Luna
Active Parameters
Undisclosed
Context Length
1.05M
Modality
Multimodal
Architecture
Mixture of Experts (MoE)
License
Proprietary
Release Date
9 Jul 2026
Knowledge Cutoff
Feb 2026
API Pricing (per 1M)
Input: $0.20 · Output: $1.20
Evaluation Benchmarks
Rank
#31
| Benchmark | Score | Rank |
|---|---|---|
Coding | max 0.83 | 5 |
Graduate-Level QA | 0.923 | 13 |
Data Analysis | max 0.78 | 17 |
Reasoning | max 0.86 | 25 |
Agentic Index | max 0.43 high 0.36 medium 0.26 low 0.18 Standard 0.15 | 27 41 57 76 80 |
Agent Arena | max 0.02 | 28 |
Mathematics | max 0.87 | 30 |
General | max 0.74 | 32 |
Agentic Coding | max 0.48 | 32 |
LiveBench Average | max 0.74 | 32 |
Web Development | max 1519 | 33 |
Intelligence Index | max 0.43 high 0.37 medium 0.30 low 0.26 Standard 0.19 | 34 54 88 118 155 |
Coding Index | max 0.71 high 0.63 medium 0.51 low 0.44 Standard 0.39 | 37 57 77 92 102 |
General Text | max 1453 | 53 |
Rankings
Overall Rank
#31
Coding Rank
#16
About GPT-5.6 Luna
OpenAI's GPT-5.6 Luna is a lightweight, ultrafast, and cost-effective tier designed for high-volume inference, subagent execution, and low-latency workflows.
Technical Specifications
Architecture specifications are undisclosed for proprietary models.
Resources
About GPT-5.6
OpenAI's GPT-5.6 series represents the next-generation frontier intelligence family structured into three tiered variants: Sol (flagship reasoning and autonomous agents), Terra (balanced everyday production workhorse), and Luna (lightweight, ultrafast, cost-effective inference). It introduces new max and ultra (sub-agent coordination) reasoning modes, native programmatic tool calling, a 1M token context window with 128k output tokens, and a February 16, 2026 knowledge cutoff.