Doubao Seed Code

ByteDance's frontier coding-focused reasoning model, released November 2025. Reasoning model with extended chain-of-thought; multimodal text+image input, text output; 256K context window. Free tier on the Volcengine API.

AA Intelligence Index v4.0: 34 — the highest-scoring ByteDance model on Artificial Analysis as of May 2026, well above Seed-OSS-36B (25). Successor to the open-source Seed-Coder-8B family. Proprietary — ByteDance Seed has not disclosed parameter count or architecture details.