Baidu LLM Big Closed weights

ERNIE 5.1

189 days since Baidu announced it · 9 May 2026

ERNIE 5.1 is a closed-weights LLM from Baidu, announced 9 May 2026. Its context window is 128K tokens.

Input: —; per 1M tokens
Cache write: —; per 1M tokens
Cache read: —; per 1M tokens
Output: —; per 1M tokens
Context window: 128K; tokens
Parameters: —; not disclosed

No price on the lab’s own pages.

Announcement: ernie.baidu.com/research/posts/ernie-5.1-0508-release
Our story: Our story

Our coverage

2 stories

Baidu releases smaller, cheaper ERNIE 5.1
09 May 2026
ERNIE-5.1-Preview ranks 13th on LMArena Text
30 Apr 2026

Baidu · Big · ERNIE

closed weights

ERNIE 5.1 9 May 2026

More from Baidu

All models

ERNIE 5.5 Flash Preview 11 Nov 2026
ERNIE-5.5-Flash-Base 5 Nov 2026
ERNIE-Image-Turbo 15 Apr 2026
ERNIE-Image 15 Apr 2026

Facts last updated 14 Nov 2026, from Baidu’s own pages.