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
#41
| Benchmark | Score | Rank |
|---|---|---|
Coding | max 0.83 | 5 |
Graduate-Level QA | 0.923 | 14 |
Data Analysis | max 0.78 | 19 |
Reasoning | max 0.86 | 27 |
Agent Arena | max -0.44 | 32 |
Agentic Index | max 0.42 high 0.35 medium 0.24 low 0.16 Standard 0.13 | 32 50 71 87 94 |
Mathematics | max 0.87 | 35 |
LiveBench Average | max 0.74 | 35 |
General | max 0.74 | 36 |
Agentic Coding | max 0.48 | 36 |
Web Development | max 1519 | 39 |
Coding Index | max 0.71 high 0.63 medium 0.51 low 0.44 Standard 0.39 | 42 62 87 102 110 |
Intelligence Index | max 0.37 high 0.32 medium 0.25 low 0.21 Standard 0.15 | 47 69 102 133 180 |
General Text | max 1452 | 58 |
Rankings
Overall Rank
#41
Coding Rank
#22
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.