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Seed OSS 36B

bytedancebytedance/seed-oss-36b

API guide

Chat completion

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"bytedance/seed-oss-36b","messages":[{"role":"user","content":"Explain the difference between GQA and MQA in one paragraph."}]}'

Reasoning with thinking budget

Seed-OSS-36B supports an optional thinking-budget parameter (provider-dependent). Setting a budget (e.g., 2048) caps chain-of-thought length, improving latency on simpler tasks while preserving full reasoning when the budget is large or omitted.

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance/seed-oss-36b",
    "messages": [{"role":"user","content":"Solve AIME 2025 problem 12 step by step."}],
    "extra_body": {"thinking_budget": 4096}
  }'

Tool use

Strong agentic performance (SWE-Bench 56 %, TAU1-Retail 70.4 %). Use for tool-calling agents that benefit from controllable reasoning depth.

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance/seed-oss-36b",
    "messages": [{"role": "user", "content": "Find the latest commit on the main branch."}],
    "tools": [{"type":"function","function":{"name":"git_log","parameters":{"type":"object","properties":{"branch":{"type":"string"}}}}}]
  }'
Fact ledger β€” every claim on this page traces here
sourceURLretrieved
Release dategithub.com β†—2026-05-25verified
Licensegithub.com β†—2026-05-25verified
Architecturegithub.com β†—2026-05-25verified
Context windowgithub.com β†—2026-05-25verified
Training datagithub.com β†—2026-05-25verified
Thinking budget controlgithub.com β†—2026-05-25verified
Inference backendsgithub.com β†—2026-05-25verified
AIME24github.com β†—2026-05-25verified
AIME25github.com β†—2026-05-25verified
LiveCodeBench v6github.com β†—2026-05-25verified
SWE-Bench Verified (OpenHands)github.com β†—2026-05-25verified
RULER (128K)github.com β†—2026-05-25verified
MMLU-Progithub.com β†—2026-05-25verified
ByteDance Seed releases Seed-OSS-36B family under Apache 2.0github.com β†—2026-05-25verified
How does the thinking budget feature work?github.com β†—2026-05-25to verify
Is Seed-OSS-36B suitable for production agent deployments?github.com β†—2026-05-25to verify
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