OpenAI: GPT-6 Luna
OpenAI's GPT-6 Luna is a language model that supports text input, image input, and file input, making it versatile in terms of modality. It can handle context lengths of up to 1.05 million tokens, allowing for long-form processing. Additionally, the model has reasoning capabilities and can integrate with tools. Considering its price point, GPT-6 Luna may be worth considering for organizations or individuals who require a robust language model that can handle various input types. At $0.1 per million input tokens and $0.5 per million output tokens, it falls in line with other high-end models on the market. However, its benchmark performance is not as extensively tested, with only one independent benchmark available.
Benchmark results
Independent, published benchmarks. Blended score 62.2 across 1 benchmark, last refreshed 2026-09-23. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 61.5 |
- Model ID
- openai/gpt-6-luna
- Vendor
- openai
- Released
- September 2026
- Tokenizer
- GPT
- Input Modalities
- file, image, text
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $0.10/M input and $0.50/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | under $0.01 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.08 |
| A month of a busy support chatbot | 5M in / 2M out | $1.50 |
Category rankings
Where OpenAI: GPT-6 Luna places across the 15 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #10 | Short-Form SummarizationWriting · of 25 ranked | 127 |
| #10 | Email DraftingWriting · of 25 ranked | 123 |
| #10 | Language LearningEducation · of 25 ranked | 123 |
| #10 | Image CaptioningVision · of 25 ranked | 120 |
| #10 | Chat CompanionPersonal · of 25 ranked | 127 |
| #14 | Social Media PostsWriting · of 25 ranked | 119 |
| #14 | Voice Assistant BackendVoice · of 25 ranked | 123 |
| #14 | Trivia & General KnowledgePersonal · of 25 ranked | 117 |
| #16 | Code CompletionCode · of 25 ranked | 133 |
| #17 | Sales / Cold EmailBusiness · of 25 ranked | 119 |
| #17 | Job Application DraftingBusiness · of 25 ranked | 119 |
| #17 | Journaling HelperPersonal · of 25 ranked | 119 |
| #17 | Recipe GenerationPersonal · of 25 ranked | 119 |
| #21 | JSON ExtractionData · of 25 ranked | 131 |
| #23 | Customer SupportBusiness · of 25 ranked | 127 |
Similar models
OpenAI: GPT-6 Luna Pro
OpenAI: GPT-6 Luna Pro (batch)
OpenAI: GPT-6 Luna (batch)
OpenAI: GPT-6 Sol Pro
OpenAI: GPT-6 Sol Pro (batch)
OpenAI: GPT-6 Sol
Quick answers
- How much does OpenAI: GPT-6 Luna cost?
- $0.10 per million input tokens and $0.50 per million output tokens.
- What is OpenAI: GPT-6 Luna's context window?
- 1,050,000 tokens, roughly 1,575 pages of text in a single request.
- Does OpenAI: GPT-6 Luna support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: GPT-6 Luna process images?
- Yes, it accepts image input.