GPT-5.6 Luna: Release Intelligence, Performance & Price
Available providers
Model summary
Verbosity
The GPT-5.6 Luna release offers 6 models, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across the 6 models.
- For intelligence, the top model of GPT-5.6 Luna is GPT-5.6 Luna (Max) at 37.
- For output speed, the fastest model is GPT-5.6 Luna (Max) at 126 t/s.
- For latency, GPT-5.6 Luna (Non-reasoning) at 0.75s offers the lowest time to first answer token.
- For pricing, GPT-5.6 Luna (Low) at $0.01 offers the lowest cost per task. Prices vary up to 18x across models.
| Input modality | Supports: text and image |
|---|---|
| Output modality | Supports: text |
| Context window | 1M ~1500 A4 pages of size 12 Arial font |
Metrics are compared against models of the same class:
- Non-reasoning models → compared only with other non-reasoning models
- Reasoning models → compared across both reasoning and non-reasoning
- Open weights models → compared only with other open weights models of the same size class:
- Tiny: ≤4B parameters
- Small: 4B–40B parameters
- Medium: 40B–150B parameters
- Large: >150B parameters
- Proprietary models → compared across proprietary and open weights models of the same price range, using a blended 3:1 input/output price ratio:
- <$0.15 per 1M tokens
- $0.15–$1 per 1M tokens
- >$1 per 1M tokens
Intelligence
Artificial Analysis Intelligence Index
Intelligence Index vs. Cost per Task
Cost
Cost per Intelligence Index Task
Speed & Latency
Output Speed
Capability Scores
Capability Indexes
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 6 evaluations: GDPval-AA v2.1, AA-Briefcase v1.1, AA-Omniscience, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AA-LCR v1.1, GDP.pdf, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, MLCR-AA, Humanity's Last Exam, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, Humanity's Last Exam, CritPt, GDPval-AA v2.1, AA-Briefcase v1.1, Terminal-Bench 4.0 · Higher is better
Incorporates 5 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2.1, AA-Briefcase v1.1, AA-LCR v1.1 · Higher is better
Evaluations
Agentic knowledge work, Elo
Knowledge
1 - hallucination rate
Agentic SaaS workflows
Agentic real-world work tasks, Elo
Reasoning & knowledge
Professional document reasoning, All-pass
Agentic coding & terminal use
Long context reasoning
Coding
Physics reasoning
Agentic scientific research workflows in a terminal
Agentic business operations
Kubernetes incident root-cause analysis
Medical long context reasoning
Visual reasoning
More from OpenAI
Further details
Weights | Provider Benchmarks | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| GPT-5.6 Luna (Max) |  OpenAI | 37 | - | 1M | $0.2 | 126 | Not available |  | |
| GPT-5.6 Luna (Xhigh) | OpenAI | 35 | - | 1M | $0.2 | 122 | Not available |  | |
| GPT-5.6 Luna (High) | OpenAI | 32 | - | 1M | $0.2 | 120 | Not available | | |
| GPT-5.6 Luna (Medium) | OpenAI | 25 | - | 1M | $0.2 | 114 | Not available | | |
| GPT-5.6 Luna (Low) | OpenAI | 21 | - | 1M | $0.2 | 117 | Not available | | |
| GPT-5.6 Luna (Non-reasoning) | OpenAI | 16 | - | 1M | $0.2 | 116 | Not available | |