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Doubao-Seed-1.8

ByteDance · Seed line · flagship

Released December 18, 2025Replaced by Doubao-Seed-2.0-Pro

Doubao-Seed-1.8 was released by ByteDance on December 18, 2025, as a flagship model in the Seed line.

  • Release 5 of 7 in the Seed line.
  • Came 190 days after Doubao-Seed-1.6, released Jun 11, 2025.
  • Replaced by Doubao-Seed-2.0-Pro on February 14, 2026, 58 days later.
  • These days the line ships a new model about every 85 days.

No detailed card for this model: we only add numbers published by the maker or by independent benchmarks. Sources: ByteDance Seed · Volcano Engine

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Where the Seed line stands

Doubao-Seed-2.1-Pro is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

Seed

ByteDance · flagship line

Latest: Doubao-Seed-2.1-Pro · Jun 23, 2026

Past its usual gap110 days since the last release — usual gap is 85
Days since last release
110
days
Usual gap
85
days
Recent gaps
Doubao-Seed-2.1-Pro · Jun 2026
129
Doubao-Seed-2.0-Pro · Feb 2026
58
Doubao-Seed-1.8 · Dec 2025
190
Doubao-Seed-1.6 · Jun 2025
55

Every Seed release

Newest first. See the full line with every card →

  1. Jun 23, 2026Doubao-Seed-2.1-Pro
  2. Feb 14, 2026Doubao-Seed-2.0-Pro
  3. Dec 18, 2025Doubao-Seed-1.8 · this page
  4. Jun 11, 2025Doubao-Seed-1.6
  5. Apr 17, 2025Doubao-1.5-thinking-pro
  6. Jan 22, 2025Doubao-1.5-pro
  7. May 15, 2024Doubao-pro