baidu · Balanced
ERNIE 5.1
ERNIE 5.1 is the latest Wenxin model, with broad upgrades to agentic workflows, knowledge, reasoning, and deep search. ⚠️ Note: privacy and logging guarantees may be limited.
- Input
- Text
- Output
- Text
- Discovery tier
- Balanced
Pricing
USD per 1M tokens- Input
- $0.75
- Output
- $3.00
- Cache read
- $0.75
Reference prices as published by the model provider. API example
Specifications
- Context window
- 119K
- Max output
- 64K
- Average output (7 days)
- 1.9K tokens
- Longer than 90% of 468 models
Side by side
ERNIE 5.1 compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| ERNIE 5.1baiduThis model | LongCat 2.5 PreviewlongcatRemove | |
|---|---|---|
| Provider | baidu | longcat |
| Discovery tier | Balanced | Balanced |
| Added | May 10, 2026 | Sep 27, 2026 |
| Limits | ||
| Context window | 119K | 1MBest |
| Max output | 64K | 131.07KBest |
| Average output | 1.9K tokens | — |
| Pricing, USD per 1M tokens | ||
| Input | $0.75 | $0.75 |
| Output | $3.00 | $2.95Best |
| Cache read | $0.75 | $0.015Best |
| Performance | ||
| Request success (24h) | — | 99.7% |
| Capabilities | ||
| Reasoning | No | Yes |
| Tools | No | Yes |
| Vision | No | Yes |
| Reasoning effort | — | — |
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
- ERNIE 5.1
- LongCat 2.5 Preview
| Leaderboard | ERNIE 5.1 | LongCat 2.5 Preview |
|---|---|---|
| Search Overall | #9 · 1226.7 | Not in top 20 |
Ranks among Noumen catalog models on LMArena leaderboards. Only top-20 placements are listed.LMArena
Developers
Use it through the API
Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.
curl https://www.noumen.xyz/api/v1/chat/completions \
-H "Authorization: Bearer $NOUMEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "ernie-5.1",
"messages": [{ "role": "user", "content": "Explain this stack trace." }]
}'import os
from openai import OpenAI
client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
model="ernie-5.1",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)baidu
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