Thinking Machines: Inkling vs OpenAI: GPT-5.6 Terra Pro
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-19.
| Thinking Machines: Inkling | OpenAI: GPT-5.6 Terra Pro | |
|---|---|---|
| Vendor | thinkingmachines | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 37.2 | - |
| Input Price | $1.00/M | $2.00/M |
| Output Price | $4.05/M | $12.00/M |
| Context Window | 524,288 | 1,050,000 |
| Max Output | 471,859 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | - | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | ✓ | - |
| Benchmark Scores | ||
| ai_index | 41.2 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Inkling costs $2.01 and GPT-5.6 Terra Pro costs $5.00, so Inkling is about 2.5 times cheaper for the same work.
GPT-5.6 Terra Pro reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 786 pages for Inkling.
Only Inkling offers audio input; only GPT-5.6 Terra Pro offers structured output.
Across the 20 tasks where they differ, Inkling scores higher on 13 (Code Review, Code Completion, Code Refactoring and others), GPT-5.6 Terra Pro on 7 (SQL Generation, Unit Test Generation, CSV / Spreadsheet Cleanup and others).
Pick Inkling if you need lower cost or audio input; pick GPT-5.6 Terra Pro if you need long documents or structured output.
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 | OpenAI: GPT-5.6 Terra Pro |
|---|---|---|
| SQL Generation | 130 | 132 |
| Code Review | 135 | 132 |
| Code Completion | 119 | 117 |
| Code Refactoring | 138 | 136 |
| Bug Fixing | 143 | 136 |
| Unit Test Generation | 120 | 124 |
| Code Documentation | 134 | 129 |
| Regex Writing | 123 | 117 |
| CI/CD Pipelines | 120 | 120 |
| Frontend Component Design | 122 | 122 |
| Data Analysis | 126 | 124 |
| CSV / Spreadsheet Cleanup | 123 | 132 |
| ETL Scripting | 129 | 128 |
| JSON Extraction | 111 | 121 |
| Bulk Data Labeling | 116 | 117 |
| OCR / Document Parsing | 125 | 131 |
| Table Extraction from PDFs | 125 | 131 |
| Long-Document Summarization | 144 | 136 |
| Short-Form Summarization | 117 | 113 |
| Blog Post Writing | 126 | 120 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →