The Model Index
Models/Labs/ByteDance
Lab · 5 models · since May 2024

ByteDance

ByteDance has 5 models on The Model Index, from Doubao Pro (May 2024) to Seed 2.1 (12 Aug 2026). All are closed models.

5models tracked0 open · 5 closed
–no model scored yet
12 Aug 2026latest releaseSeed 2.1
2current versions3 replaced by newer ones

Every modelnewest first

ModelReleasedWeightsIndex scoreInput $/MOutput $/MContext
Seed 2.112 Aug 2026Closed
not scored yet
–––
Seed 2.0replaced14 Feb 2026Closed
not scored yet
–––
Seed 1.6replaced11 Jun 2025Closed
not scored yet
$0.25$2.0262K
Doubao 1.5 Pro22 Jan 2025Closed
not scored yet
–––
Doubao Proreplaced15 May 2024Closed
not scored yet
–––

Index score is fitted from independent evaluations and scaled so GPT-4 = 100; a striped bar is an estimate for a model not yet independently tested. Prices are list prices per million tokens.

Release history5 announcements

The Race →
DateReleaseKindSource
12 Aug 2026Seed 2.1Flagshipno link
14 Feb 2026Seed 2.0Flagshipseed.bytedance.com ↗
11 Jun 2025Seed 1.6Reasoningno link
22 Jan 2025Doubao 1.5 ProFlagshipno link
15 May 2024Doubao ProFlagshipno link

Dates come from each lab's own announcement, linked where one exists.