OpenAI: GPT-5.6 Luna Pro vs MoonshotAI: Kimi K2.6
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| OpenAI: GPT-5.6 Luna Pro | MoonshotAI: Kimi K2.6 | |
|---|---|---|
| Vendor | openai | moonshotai |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 76.7 |
| Input Price | $0.20/M | $0.65/M |
| Output Price | $1.20/M | $3.41/M |
| Context Window | 1,050,000 | 262,144 |
| Max Output | 128,000 | 235,929 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | - | 73.0 |
| ai_index_agentic | - | 49.9 |
| ai_index_coding | - | 100.0 |
| eqbench | - | 63.5 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.6 Luna Pro costs $0.50 and Kimi K2.6 costs $1.50, so GPT-5.6 Luna Pro is about 3.0 times cheaper for the same work.
GPT-5.6 Luna Pro reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 393 pages for Kimi K2.6.
Across the 20 tasks where they differ, Kimi K2.6 on 20 (SQL Generation, Code Review, Code Completion and others).
GPT-5.6 Luna Pro was released in July 2026 and Kimi K2.6 in April 2026.
Pick GPT-5.6 Luna Pro if you need lower cost or long documents; pick Kimi K2.6 if you need the stronger all-round task scores.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Who wins by task?
| Task | OpenAI: GPT-5.6 Luna Pro | MoonshotAI: Kimi K2.6 |
|---|---|---|
| SQL Generation | 133 | 168 |
| Code Review | 132 | 164 |
| Code Completion | 131 | 131 |
| Code Refactoring | 136 | 160 |
| Bug Fixing | 136 | 174 |
| Unit Test Generation | 124 | 152 |
| Code Documentation | 131 | 140 |
| Regex Writing | 119 | 136 |
| CI/CD Pipelines | 120 | 142 |
| Frontend Component Design | 122 | 145 |
| Data Analysis | 124 | 166 |
| CSV / Spreadsheet Cleanup | 133 | 151 |
| ETL Scripting | 128 | 151 |
| JSON Extraction | 131 | 147 |
| Bulk Data Labeling | 129 | 134 |
| OCR / Document Parsing | 131 | 144 |
| Table Extraction from PDFs | 131 | 144 |
| Long-Document Summarization | 137 | 156 |
| Short-Form Summarization | 123 | 131 |
| Blog Post Writing | 121 | 139 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →