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Seed-Coder

ByteDanceOpen WeightsPending Human Review

Seed-Coder is ByteDance Seed’s 8B coding language-model family, released on May 8 under MIT. Its base, instruction, and reasoning checkpoints share a model-centric data pipeline in which language models curate code corpora rather than relying solely on handcrafted filters. Base and instruction models support 32K context, while the reinforcement-trained reasoning variant supports 64K; this page uses the common 32K limit and records the larger variant explicitly. The base supports fill-in-the-middle completion, while instruction and reasoning variants address conversational code generation and difficult programming tasks. All routine checkpoints are grouped on one family page.

2025-05-08
8B
Decoder-only causal Transformer
MIT

Specifications

Parameters
8B
Architecture
Decoder-only causal Transformer
License
MIT
Context Window
32,768 tokens
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Seed-Coder
API Access
Not Available
Chat Interface
Not Available
Variants
Seed-Coder-8B-Base (32K)Seed-Coder-8B-Instruct (32K)Seed-Coder-8B-Reasoning (64K)Seed-Coder-8B-Reasoning-bf16 (64K)

Capabilities & Limitations

Capabilities
code generationcode reasoningfill-in-the-middleinstruction following
Known Limitations
Generated code requires review and testingReasoning context and behavior differ from base and instruction variantsCoding specialization does not establish general agent execution ability
Notable Use Cases
local coding assistancecode completionprogramming-model research

Related Models