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ERNIE 5.1

Baidu

Key facts · verified Oct 29, 2026

ERNIE 5.1 is a Baidu model released on 8 May 2026. Its API price is $0.59 per million input tokens and $2.65 per million output tokens (¥0.004 / ¥0.018 per 1K tokens for input up to 32K, ¥0.006 / ¥0.022 for 32K-128K (Baidu Qianfan, CNY only; USD fields are a third-party conversion)). Its context window is 128k tokens. It ranks #51 on LMArena's text leaderboard (Elo 1467, read 1 Nov 2026). Source: cloud.baidu.com.

ERNIE 5.1 is a mixture-of-experts model from Baidu, which states it was trained at roughly 6% of the compute cost of comparable frontier models. It is hosted-only via Baidu Qianfan, and Baidu names Chinese-language, legal and maths work among its uses.

Pricing & specs checkedSource: vendor documentation · checked Oct 29, 2026LMArena: 1467 Elo (rank 51) · source · retrieved Nov 1, 2026
Pricing

$0.59 / $2.65 per million tokens

Context

128k tokens

LMArena Elo

1467

LMArena rank

#51

Key Features

Text Only Chinese Language Legal Reasoning Math Function Calling
AI model rankings Compare AI models

Full Specifications

ERNIE 5.1 logo
ERNIE 5.1Baidu
$0.59 / $2.65 per million tokens
Identity
DeveloperBaidu
ReleasedMay 2026
StatusGA
LicenceProprietary
Self-hostableNo
Cost
Blended $/1M tokensinput × 0.75 + output × 0.25$1.105 / 1M tokens
Input price$0.590 / 1M tokens
Output price$2.650 / 1M tokens
Cached inputNot published
Batch discountNot published
Free tierTrial credits for new accounts, no ongoing free tier
Capacity
Context window128k tokens
Max output65,536 tokens
Long-context surchargeNot published
Capability
Vision inNo
Audio inNo
Function callingYes
Structured outputNot published
Extended reasoningNot published
Web searchNot published
Code executionNot published
Access
APIYes
Chat appYes (ERNIE Bot)
Cloud marketplacesNot published
Fine-tuningNot published
Measured quality
LMArena Elo1467 (checked Nov 2026)
LMArena rankRank 51
Elo per dollarLMArena Elo ÷ blended $/1M tokens1328