ByteDance Seed: Seed 2.1 Turbo vs OpenAI: GPT-5.6 Sol Pro (batch)

For a sample job of 1 million input tokens and 250,000 output tokens, Seed 2.1 Turbo costs $1.12 and GPT-5.6 Sol Pro (batch) costs $2.25, so Seed 2.1 Turbo is about 2.0 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 393 pages for Seed 2.1 Turbo.

Only Seed 2.1 Turbo offers video input.

Across the 18 tasks where they differ, Seed 2.1 Turbo scores higher on 5 (Code Completion, Regex Writing, JSON Extraction and others), GPT-5.6 Sol Pro (batch) on 13 (SQL Generation, Code Review, Code Refactoring and others).

Seed 2.1 Turbo was released in August 2026 and GPT-5.6 Sol Pro (batch) in July 2026.

Pick Seed 2.1 Turbo if you need lower cost or video input; pick GPT-5.6 Sol Pro (batch) if you need long documents 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.