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Doubao Seed 1.6 Thinking

ByteDanceProprietaryPending Human Review

Seed1.6 Thinking is ByteDance’s separately named extended-reasoning tier for mathematical, coding, and visual problems. It is post-trained on the Seed1.6 mixture-of-experts foundation with repeated rejection fine-tuning and reinforcement learning, integrating image understanding into long reasoning traces. It emphasizes sustained deliberation rather than selecting thinking automatically for each prompt. Volcano Engine offers the model under Doubao API identifiers, with a 256K context. The official June 2025 technical introduction documents a public try link; the release month is retained because the first public day is not independently verified.

2025-06
230B total, 23B active
Multimodal Mixture-of-Experts Transformer
Proprietary

Specifications

Parameters
230B total, 23B active
Architecture
Multimodal Mixture-of-Experts Transformer
License
Proprietary
Context Window
256,000 tokens
Type
multimodal
Modalities
textimage

Benchmark Scores

Advanced Specifications

Model Family
Seed
API Access
Available
Chat Interface
Not Available
Variants
doubao-seed-1-6-thinking-250615

Capabilities & Limitations

Capabilities
extended reasoningmathematicscodingvision
Known Limitations
Public weights are unavailableLong reasoning traces increase response cost and latencyReported parallel-decoding results depend on inference settings
Notable Use Cases
visual mathematical problem solvingtechnical reasoningcomplex code assistance

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