ByteDance has officially opened the API for its Doubao Seed 2.1 large language model on its Volcengine cloud platform, rolling out the full series with a unified 256k context window. The new lineup includes two deep-thinking models: Pro and Turbo, with major upgrades in complex code delivery, long-chain agent execution, and multimodal vision capabilities.
According to benchmarks released by the company, the flagship Doubao-Seed-2.1-pro approaches or surpasses GPT-5.5 in several coding and development evaluations. In tests like SciCode (scientific computing) and NL2Repo…