GPT-6 Luna
Strong value for high-volume usage.
Overview
GPT-6 Luna was released on 22 September 2026 together with GPT-6 Sol. It is the smallest model of the GPT-6 family, built for repetitive, high-volume tasks: classification, extraction, routine transformations, and routing requests to a stronger model when needed. It costs $0.10 per million input tokens and $0.50 output, with a 90% discount on cached input. It shares Sol's 1.05-million-token context, 128,000 output tokens, text and image input, and Responses API tools. It is a natural candidate for the first stage of an agent pipeline or for bulk processing. Like every OpenAI model, it is only available through the API or OpenAI products, hosted outside the European Union by default.
Skill profile
Not disclosed
Three independent measures
What people prefer, what the model can do, what the market uses. Each source has its biases and none is enough on its own: we show them side by side, never blended.
Strengths
- World-class on Arena
- Very long context
- Competitive input pricing
Who is it for
- you build with a coding agent
- you want to control cost or self-host
- your data must stay in the EU
Ideal use cases
- Large-scale classification and extraction
- Request routing in an agent pipeline
- Minimum-cost bulk processing
Access & availability
Key specifications
What it costs per month
Estimate from sourced API prices and a hardware tier for self-hosting. Assumptions are editable.
Assumptions: 36-month amortisation, 0.25 €/kWh, 22 days/month, 1 $ = 0.92 €. Excludes labour, software licences, redundancy.
nAIvigate Trust Index
What the vendor offers and documents for professional use in Europe. An undocumented criterion counts as zero and stays visible: the score rises when the vendor publishes, not when we assume.
20/20 criteria documented · 100 %
See the criteria▾
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[](https://naivigate.com/en/model/gpt-6-luna)Data & compliance
What we know, line by line, with source and date. These lines feed the Data and Enterprise families of the Trust Index above. GDPR compliance depends on your processing, not on the model alone.
| EU data residency | On request |
| Data processing agreement (DPA) | Yes |
| Transfer outside the EU | Depends on plan |
| Training on your data | No |
| Configurable retention | Yes |
| Zero Data Retention | On request |
| Self-hostable | No |
| Declared hosting | US/EU |
Quality of this card’s data
This score measures the quality of the data on this card: price, context, Elo, licence, documented, sourced and fresh. It measures neither the model nor its compliance: for that, see the Trust Index above.
5/6 documented · 3/6 primary sources
Advanced data · for expertsArchitecture, modalities, detailed cost, full benchmarks▾
| Arena Elo | 1443 |
| MMLU | — |
| GPQA | — |
| HumanEval | — |
| SWE-Bench | — |
| MATH | — |