Identity
- Status
- active
- Developer ID
ernie-5.1- Released
- Not reported
- Version
- ERNIE 5.1
- License
- Unknown
BaiduERNIE 5.1
ERNIE 5.1 is Baidu's current flagship text model with a 128K context window and up to 64K output tokens.
- Context
- 131,072 tokens
- Inputs
- Text
- Outputs
- Text
- Released
- Not reported
Providers & Pricing
Estimate workload cost →| Provider | Input / 1M | Output / 1M | Cache read / 1M | Cache write / 1M | Observed | Evidence |
|---|---|---|---|---|---|---|
Baidu QianfanAvailable | $4.00 | $18.00 | — | — | Aug 29, 2026 | Provider-reported |
Benchmarks
All benchmark results →| ERNIE 5.1Baidu | LMArena Search Arenasearch-2026-08-24-011508720696 | 1,226.96 | — | 3,788 | ernie-5.1; 95% CI [1217.24505738, 1236.67203321]; votes 3788; rank 6unknown | Original sourcewinner eligible | Third-party benchmark |
| ERNIE 5.1Baidu | LMArena Text Arenatext-2026-09-01-011508720696 | 1,468.10 | — | 37,137 | ernie-5.1; 95% CI [1463.48233336, 1472.72453179]; votes 37137; rank 25unknown | Original sourcewinner eligible | Third-party benchmark |
At a Glance
Model Facts
Capacity
- Context
- 131,072 tokens
- Maximum output
- 65,536 tokens
- Total parameters
- Unknown
- Active parameters
- Unknown
- Knowledge cutoff
- Not reported
Interface and Access
- Inputs
- Text
- Outputs
- Text
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- Reasoning
- Yes
- Vision
- No
- Tool calling
- Yes
- Capabilities
- agents, chat, reasoning, search, tools
This page represents one immutable developer model ID. Serving endpoints, pricing, regions, quantizations, and service tiers attach separately and never create duplicate model records.
Version Lineage
PredecessorUnknown
SuccessorsUnknown
Aliasesernie-5.1, ERNIE-5.1
Explicit Unknowns
- Release date
- Architecture
- Tokenizer
- Knowledge cutoff
Primary Evidence
Sources and Observation Date
Comparable Peers
Related Model Comparisons
| A | Pair | B | Context |
|---|---|---|---|
ERNIE 5.1Baidu | vs | ERNIE X1.1Baidu | family variantstext |
ERNIE 5.1Baidu | vs |  Sonar Deep ResearchPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Sonar Reasoning ProPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  GLM-5.3Z.ai | cross-developer peerstext |
ERNIE 5.1Baidu | vs | ERNIE-4.5-0.3B-PTBaidu | family variantstext |
ERNIE 5.1Baidu | vs |  Command ACohere | cross-developer peerstext |
ERNIE 5.1Baidu | vs | SonarPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Sonar ProPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Hy4 previewTencent | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Antigravity AgentGoogle DeepMind | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  gpt-oss-120bOpenAI | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Hy3Tencent | cross-developer peerstext |
Questions
ERNIE 5.1 FAQs
What is ERNIE 5.1?+
ERNIE 5.1 is Baidu's current flagship text model with a 128K context window and up to 64K output tokens. It is developed by Baidu and its current sourced lifecycle status is active.
What inputs and outputs does ERNIE 5.1 support?+
ERNIE 5.1's current record lists Text as input and Text as output.
How much context does ERNIE 5.1 support?+
The current record lists a 131,072-token context window and a maximum output of 65,536 tokens.
Is ERNIE 5.1 available through an API?+
ERNIE 5.1 is marked as API-available. The directly sourced provider records currently include Baidu Qianfan.
How much does ERNIE 5.1 cost through an API?+
The lowest directly sourced prices currently attached to ERNIE 5.1 are $4.00 per million input tokens through Baidu Qianfan and $18.00 per million output tokens through Baidu Qianfan. Prices are provider-specific and should be checked against each cited observation date.
What capabilities and tasks does ERNIE 5.1 support?+
ERNIE 5.1's recorded capabilities are agents, chat, reasoning, search, and tools. Its supported tasks are agents, reasoning, search, and text.
Can ERNIE 5.1 be self-hosted?+
ERNIE 5.1 is not marked as an open-weight model. Self-hosting is marked as unsupported, with no license recorded.
Does ERNIE 5.1 have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are ernie-5.1 and ERNIE-5.1.
Which models can ERNIE 5.1 be compared with?+
The current compatible peer set includes ERNIE X1.1, Sonar Deep Research, Sonar Reasoning Pro, GLM-5.3, and ERNIE-4.5-0.3B-PT. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →
How current is the Model Markets record for ERNIE 5.1?+
ERNIE 5.1 was last verified Aug 29, 2026 from Baidu's primary source, “Qianfan Model List | Baidu AI Cloud.” The evidence is classified as official fact.