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ERNIE 5.1

Baidu's closed-weight flagship LLM, distilled from ERNIE 5.0; served via Qianfan and the ERNIE app.

Baidu
Closed
Released 9 May 2026

Where it ranks

A
Chat & assistants
Models · Cloud · 1,467 on LMArena Text Arena (overall, style control)
A
Search & research
Models · Cloud · 1,192 on LMArena Search Arena (style control)
A
Writing
Models · Cloud · 1,427 on LMArena Text Arena: Creative Writing (style control)

Facts

Vendor: Baidu
Family: ERNIE
Released: 9 May 2026
Weights: Closed: API and apps only
Access: Paid only
Last verified: 19 Oct 2026

Price from ernie.baidu.com, 19 Oct 2026.

Benchmark results

Benchmark	Result	Entry on the leaderboard	As of	Source
LMArena Search Arena (style control)	1,192	`ernie-5.1` From LMArena's official leaderboard-dataset (search_style_control, split latest, category overall, published 2026-10-13), which mirrors https://arena.ai/leaderboard/search. Rank 26 of 42; 4024 votes; 95% CI 1182.7-1201.6.	13 Oct 2026	huggingface.co
LMArena Text Arena (overall, style control)	1,467	`ernie-5.1` From LMArena's official leaderboard-dataset (text_style_control, split latest, category overall, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text. Rank 50; 39468 votes; 95% CI 1462.5-1471.5.	15 Oct 2026	huggingface.co
LMArena Text Arena: Creative Writing (style control)	1,427	`ernie-5.1` From LMArena's official leaderboard-dataset (text_style_control, split latest, category creative_writing, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text/creative-writing. Rank 76 of 414; 6454 votes; 95% CI 1418.9-1435.6.	15 Oct 2026	huggingface.co

Where you can use it

AWenxin Assistant (ERNIE Bot)Apps · Cloud

Earlier versions

ERNIE 5.0 · Jan 2026

Sources