Seed 2.1 Turbo

bytedance/seed-2.1-turbo

A chat model with a 262K-token context window, at $0.525 per million input tokens and $2.625 per million output tokens.

Details

Maker: bytedance
Kind: Chat
Context window: 262,144 tokens
Max output: 262,144 tokens
Input: $0.525 per million tokens
Cached input: $0.105 per million tokens, 80% off
Cache write: Same as input
Output: $2.625 per million tokens
Capabilities: Reasoning, tool use, vision
Takes: Text, image, video
Returns: Text
Zero data retention: Not on every provider
No training on requests: Yes, on every provider
Released: 2026-06-23

Description

Seed 2.1 Turbo is ByteDance’s multimodal language model supporting text, image, and video inputs with text output. It offers a 262,144-token context window, reasoning, function calling, and structured JSON output.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance/seed-2.1-turbo",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Set PHANTOM_KEY to your key. Any OpenAI client works with the base URL https://phantom.codes/v1.

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