ERNIE 5.1
Compressed ERNIE 5.0 sub-network with a third of the total and half the active parameters, at a claimed 6% of comparable pretraining cost.
Derived from ERNIE 5.0's elastic sub-model matrix, with a new fully asynchronous RL stack for agentic post-training. Preview on 2026-04-29; official release 2026-05-08/09. Hosted only, with no weights.
- Date
- Friday, 8 May 2026
- Lab
- Baidu
- Kind
- model
- Access
- closed API
- Price
- $0.59 input / $2.65 output per M tokens (Codersera), 2026-05
Figures
| Measure | Value | Measured by |
|---|---|---|
| LMArena Search Arena | 1,223, 4th globally 2026-05-09, 1st among Chinese models | independent |
| Pretraining compute vs comparable models | about 6% company claim | company |
| AIME26 with tools | 99.6 second to Gemini 3.1 Pro per Baidu | company |
Baidu's blog post is dated 2026-05-09; 'ERNIE 5.1 officially released' on 2026-05-08 per aggregators. Wikipedia lists ERNIE 5.1 as Apache-licensed, which contradicts Baidu's hosted-only release; Baidu's own post offers no weights. Price $0.59/$2.65 per M tokens per Codersera.
Sources
- ernie.baidu.com/blog/posts/ernie-5.1-0508-release/
- ernie.baidu.com/blog/posts/ernie-5.1-preview-0430-release-on-lmarena/
- codersera.com/blog/baidu-ernie-5-1-launch-2026/
This record was checked against its sources on 6 October 2026. How we check