Antimatter
ByteDance

Seed 2.1 Turbo

bytedance-seed/seed-2-1-turbo

Seed 2.1 Turbo is a multimodal model from ByteDance Seed for coding and long-horizon agent workflows.

$0.55 in · $2.75 out per 1M tokens262k contextAug 12, 2026

about 0.2¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with Seed 2.1 Turbo
Call it from codeLock this price

Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens
$0.55provider $0.50
Output, per 1M tokens
$2.75provider $2.50
Margin
+10%

Context and formats

Context window
262,144 tokens
Longest answer
235,929 tokens
Reads
text, images, and video
Makes
text
First listed
2026-08-12

Measured here, last 7 days

First token, median
not measured
Answered without error
not measured

Tools and JSON

Tool calling
declaredthe provider's claim, not yet measured here
JSON output
declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=bytedance-seed/seed-2-1-turbo.

About

Seed 2.1 Turbo is a multimodal model from ByteDance Seed for coding and long-horizon agent workflows. It is suited for end-to-end software delivery, multi-step task execution, and understanding visual and...

In ByteDance's words.

Try it here

The answer appears here.

Measured here

Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "bytedance-seed/seed-2-1-turbo", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

Seed 2.1 Turbo price on Antimatter
<a href="https://useantimatter.com/planet/bytedance-seed/seed-2-1-turbo"><img src="https://useantimatter.com/api/badge/price?id=bytedance-seed%2Fseed-2-1-turbo" alt="Seed 2.1 Turbo price on Antimatter" height="28"></a>

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