Thinking Machines: Inkling vs OpenAI: GPT-5.6 Sol Pro (batch)

For a sample job of 1 million input tokens and 250,000 output tokens, Inkling costs $2.01 and GPT-5.6 Sol Pro (batch) costs $4.50, so Inkling is about 2.2 times cheaper for the same work.

GPT-5.6 Sol Pro (batch) 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 Sol Pro (batch) offers structured output.

Across the 19 tasks where they differ, Inkling scores higher on 6 (Code Completion, Code Documentation, Regex Writing and others), GPT-5.6 Sol Pro (batch) on 13 (SQL Generation, Code Review, Code Refactoring and others).

Pick Inkling if you need lower cost or audio input; pick GPT-5.6 Sol Pro (batch) if you need 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.