Thinking Machines: Inkling Small vs OpenAI: GPT-5.6 Luna
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Thinking Machines: Inkling Small | OpenAI: GPT-5.6 Luna | |
|---|---|---|
| Vendor | thinkingmachines | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 89.4 |
| Input Price | $0.45/M | $0.20/M |
| Output Price | $1.20/M | $1.20/M |
| Context Window | 524,288 | 1,050,000 |
| Max Output | 262,144 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | - | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | ✓ | - |
| Benchmark Scores | ||
| ai_index | - | 84.5 |
| ai_index_agentic | - | 75.2 |
| ai_index_coding | - | 100.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.6 Luna costs $0.50 and Inkling Small costs $0.75, so GPT-5.6 Luna is about 1.5 times cheaper for the same work.
GPT-5.6 Luna reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 786 pages for Inkling Small.
Only Inkling Small offers audio input; only GPT-5.6 Luna offers structured output.
Across the 20 tasks where they differ, GPT-5.6 Luna on 20 (SQL Generation, Code Review, Code Completion and others).
Pick Inkling Small if you need audio input; pick GPT-5.6 Luna if you need lower cost, long documents, structured output or 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 | Thinking Machines: Inkling Small | OpenAI: GPT-5.6 Luna |
|---|---|---|
| SQL Generation | 125 | 171 |
| Code Review | 128 | 166 |
| Code Completion | 131 | 133 |
| Code Refactoring | 132 | 163 |
| Bug Fixing | 136 | 179 |
| Unit Test Generation | 116 | 154 |
| Code Documentation | 131 | 143 |
| Regex Writing | 119 | 136 |
| CI/CD Pipelines | 116 | 144 |
| Frontend Component Design | 118 | 146 |
| Data Analysis | 120 | 170 |
| CSV / Spreadsheet Cleanup | 121 | 154 |
| ETL Scripting | 124 | 154 |
| JSON Extraction | 119 | 149 |
| Bulk Data Labeling | 125 | 135 |
| OCR / Document Parsing | 123 | 146 |
| Table Extraction from PDFs | 123 | 146 |
| Long-Document Summarization | 137 | 159 |
| Short-Form Summarization | 123 | 132 |
| Blog Post Writing | 121 | 140 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →