Seed 1.6 Flash

Seed 1.6 Flash is an ultra-fast multimodal deep thinking model by ByteDance Seed, supporting both text and visual understanding. It features a 256k context window and can generate outputs of up to 16k tokens.

ChatByteDance262k tokens$0.0818 / $0.327 · 1M

bytedance-seed/seed-1.6-flash

Context
262k tokens
Completion cap
32,768
Tools
Yes
JSON
Yes
Released
2025-12-23

Call it from Geek Hub

Same OpenAI SDK. Change the base URL and the model id.

curl https://api.geekhub.mx/v1/chat/completions \
  -H "Authorization: Bearer $GEEKHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance-seed/seed-1.6-flash",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is Seed 1.6 Flash?
Seed 1.6 Flash is an ultra-fast multimodal deep thinking model by ByteDance Seed, supporting both text and visual understanding. It features a 256k context window and can generate outputs of up to 16k tokens. Seed 1.6 Flash runs on the Geek Hub API (OpenAI-compatible). Model id: bytedance-seed/seed-1.6-flash.
Is Seed 1.6 Flash free?
No. Input is $0.0818 per 1M tokens and output is $0.327 per 1M tokens on Geek Hub (markup included).
What is the context length of Seed 1.6 Flash?
Seed 1.6 Flash has a 262k tokens context window. It supports up to 32,768 completion tokens.
Does Seed 1.6 Flash support tool calling and structured outputs?
Seed 1.6 Flash accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was Seed 1.6 Flash released?
Seed 1.6 Flash was released on 2025-12-23.

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