openai
OpenAI: GPT-5.6 Luna
The OpenAI GPT-5.6 Luna can process text, images, and files, with an expansive context length of 1,050,000 tokens and robust support for both reasoning and interacting with tools. While it excels in generating comprehensive responses, its structured output capabilities remain unverified. This model is ideal for projects requiring extensive input handling and advanced reasoning; however, given its blended benchmark score of 88.2 across three independent benchmarks, it may be a suitable choice primarily for those willing to pay the price-$0.1 per million input tokens and $0.6 per million output tokens-for its capabilities, though its performance in certain specialized areas remains unproven.
Quality Score
100/100
price + capability + benchmarks
Input Price
$0.10
per 1M tokens
Output Price
$0.60
per 1M tokens
Context Window
1,050,000
tokens
Benchmark results
Independent, published benchmarks. Blended score 88.2 across 3 benchmarks, last refreshed 2026-08-13. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 86.3 |
| AI Index Coding | software engineering tasks | 100.0 |
| AI Index Agentic | multi-step tool-using tasks | 77.4 |
- Model ID
- openai/gpt-5.6-luna
- Vendor
- openai
- Released
- July 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 $0.60/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 | $1.70 |
Price & spec history
Tracked daily by PicksByModel since 2026-07-17.
| Date | Input /M | Output /M | Context |
|---|---|---|---|
| 2026-07-31 | $0.10 | $0.60 | 1,050,000 |
| 2026-07-28 | $0.50 | $3.00 | 1,050,000 |
| 2026-07-17 | $1.00 | $6.00 | 1,050,000 |
Strong choice for
Data
JSON Extraction
Pulling structured fields out of unstructured text.
Data
Bulk Data Labeling
Cheaply tagging thousands of items with consistent labels.
Writing
Short-Form Summarization
TL;DRs of articles and emails at scale.
Writing
Email Drafting
Cold emails, replies, and outreach at the right tone.
Education
Language Learning
Conversational practice, grammar drills, vocabulary.
Business
Customer Support
Replying to tickets and chats accurately.
Category rankings
Where OpenAI: GPT-5.6 Luna places across the 40 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #1 | Bulk Data LabelingData · of 25 ranked | 135 |
| #1 | Short-Form SummarizationWriting · of 25 ranked | 132 |
| #1 | Email DraftingWriting · of 25 ranked | 128 |
| #1 | Language LearningEducation · of 25 ranked | 128 |
| #1 | Customer SupportBusiness · of 25 ranked | 135 |
| #1 | Chat CompanionPersonal · of 25 ranked | 132 |
| #1 | Trivia & General KnowledgePersonal · of 25 ranked | 122 |
| #1 | Dataset AnnotationResearch · of 25 ranked | 145 |
| #2 | JSON ExtractionData · of 25 ranked | 149 |
| #2 | Image CaptioningVision · of 25 ranked | 121 |
| #3 | Sales / Cold EmailBusiness · of 25 ranked | 124 |
| #3 | Job Application DraftingBusiness · of 25 ranked | 124 |
| #3 | Journaling HelperPersonal · of 25 ranked | 124 |
| #3 | Recipe GenerationPersonal · of 25 ranked | 124 |
| #7 | Code CompletionCode · of 25 ranked | 133 |
| #10 | Resume WritingBusiness · of 25 ranked | 118 |
| #12 | Social Media PostsWriting · of 25 ranked | 119 |
| #12 | Voice Assistant BackendVoice · of 25 ranked | 123 |
| #13 | Regex WritingCode · of 25 ranked | 137 |
| #13 | Language TranslationWriting · of 25 ranked | 137 |
| #13 | Tutoring for KidsPersonal · of 25 ranked | 137 |
| #14 | SOP / Process DocsBusiness · of 25 ranked | 138 |
| #15 | Meeting NotesBusiness · of 25 ranked | 152 |
| #17 | Code DocumentationCode · of 25 ranked | 143 |
| #18 | CSV / Spreadsheet CleanupData · of 25 ranked | 154 |
| #18 | Function / Tool CallingAgents · of 25 ranked | 154 |
| #18 | Self-Hosted / LocalCost · of 25 ranked | 117 |
| #21 | Screenshot DebuggingVision · of 25 ranked | 142 |
| #21 | Real-Time ChatLatency · of 25 ranked | 117 |
| #22 | Marketing CopyWriting · of 25 ranked | 131 |
| #22 | Standardized Test PrepEducation · of 25 ranked | 131 |
| #22 | Diagram ExtractionVision · of 25 ranked | 149 |
| #23 | Frontend Component DesignCode · of 25 ranked | 146 |
| #23 | Chart & Graph ReadingVision · of 25 ranked | 152 |
| #23 | Browser AutomationAgents · of 25 ranked | 171 |
| #23 | Cheap Bulk InferenceCost · of 25 ranked | 137 |
| #24 | SQL GenerationCode · of 25 ranked | 172 |
| #24 | OCR / Document ParsingData · of 25 ranked | 146 |
| #24 | Table Extraction from PDFsData · of 25 ranked | 146 |
| #25 | Transcript CleanupWriting · of 25 ranked | 141 |
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Quick answers
- How much does OpenAI: GPT-5.6 Luna cost?
- $0.10 per million input tokens and $0.60 per million output tokens.
- What is OpenAI: GPT-5.6 Luna's context window?
- 1,050,000 tokens, roughly 1,575 pages of text in a single request.
- Does OpenAI: GPT-5.6 Luna support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: GPT-5.6 Luna process images?
- Yes, it accepts image input.