MoonshotAI: Kimi K3 vs OpenAI: GPT-5.6 Sol (batch)

For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.6 Sol (batch) costs $2.25 and Kimi K3 costs $6.75, so GPT-5.6 Sol (batch) is about 3.0 times cheaper for the same work.

Both take in a similar amount of text: 1,048,576 and 1,050,000 tokens, about 1,573 and 1,575 pages.

Only Kimi K3 offers video input.

On our blended benchmark score GPT-5.6 Sol (batch) leads 80.2 to 73.9.

Across the 20 tasks where they differ, GPT-5.6 Sol (batch) on 20 (SQL Generation, Code Review, Code Completion and others).

Pick Kimi K3 if you need video input; pick GPT-5.6 Sol (batch) if you need lower cost, benchmark performance 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.