ByteDance's dedicated coding model (released Feb 14, 2026 on Volcano Engine; Jul 30, 2026 on OpenRouter). The only specialist variant in the Seed 2.0 lineup — built for agentic software engineering rather than autocomplete. Decomposes tasks into plans and revises as work progresses. Multimodal (text + image input — reads design mockups, screenshots, charts). 128K max chain-of-thought. Powers coding in TRAE, ByteDance's AI IDE. **Best for:** multi-step feature implementation, bug diagnosis and repair, full-cycle development tasks, and code generation from visual inputs. **Caveats: still carries `-preview` suffix on Volcano Engine; closed weights; no published benchmark table from ByteDance (SWE-bench and LiveCodeBench scores cited by third parties but unconfirmed).**
Architecture Type: Dense Transformer
Standard dense autoregressive transformer architecture with full-attention mechanisms.
Recommended Workloads & Primary Use Cases
multi-step feature implementation
bug diagnosis and repair
full-cycle development tasks
closed weights
no published benchmark table from ByteDance (SWE-bench and LiveCodeBench scores cited by third parties but unconfirmed)
Calls to Seed 2.0 Code are routed through strict Zero Data Retention inference channels. Prompts and outputs are never stored, indexed, or monitored by ByteDance.
