SpaceXAI: Grok 4.6 vs OpenAI: GPT-5.6 Terra Pro (batch)

For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.6 Terra Pro (batch) costs $2.50 and Grok 4.6 costs $3.50, so GPT-5.6 Terra Pro (batch) is about 1.4 times cheaper for the same work.

GPT-5.6 Terra Pro (batch) reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 750 pages for Grok 4.6.

Across the 20 tasks where they differ, Grok 4.6 scores higher on 18 (SQL Generation, Code Review, Code Completion and others), GPT-5.6 Terra Pro (batch) on 2 (JSON Extraction, Bulk Data Labeling).

Grok 4.6 was released in August 2026 and GPT-5.6 Terra Pro (batch) in July 2026.

Pick Grok 4.6 if you need the stronger all-round task scores; pick GPT-5.6 Terra Pro (batch) if you need lower cost or long documents.

Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.