One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $0.56 = $0.56
- Output0.1M x $2.53 = $0.253
$0.813per session
Baidu - Closed weights
ERNIE 5.1 pricing and specs
ERNIE 5.1 is a closed-weights model from Baidu that costs $0.56 per 1M input tokens and $2.53 per 1M output tokens on the first-party API, with a 128K-token context window.
Last verified from intl.cloud.baidu.com. All sources
- Input / 1M
- $0.56
- Output / 1M
- $2.53
- Context
- 128K tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| InputPrompts up to 32,000 tokens | $0.56 |
| OutputPrompts up to 32,000 tokens | $2.53 |
| Long-context inputPrompts over 32,000 tokens | $0.84 |
| Long-context outputPrompts over 32,000 tokens | $3.10 |
Note: Baidu AI Cloud international (Qianfan) pay-as-you-go text generation pricing, page updated 2026-09-07. Two prompt-length tiers: Input<=32k is $0.56 in / $2.53 out; 32k<Input<=128k is $0.84 in / $3.10 out (the page writes the boundary as '32k', recorded as aboveTokens 32000). No cache-hit or batch price is listed for ERNIE 5.1. Context length is stated as '128k' (max input 119k) on the model list, recorded as 128000; max output [1, 65536]. Release date is the ERNIE blog launch post's date (May 9, 2026; the post slug reads 0508). Text generation only on the international model list. Not listed in the Vercel AI Gateway model list on 2026-10-17.
Specs
- Context window
- 128,000 tokens
- Max output
- 65,536 tokens
- Release date
- Provider
- Baidu
- API model id
ernie-5.1- Weights
- Closed weights
What ERNIE 5.1 costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts. These use the base rates, which apply while each request's prompt stays at or under 32,000 tokens; above that, ERNIE 5.1 bills $0.84 input and $3.10 output for the whole request.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $0.56 = $11.20
- Output5M x $2.53 = $12.65
$23.85per day
$715.50 per 30-day month
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| ERNIE 5.1 (this page) | $0.56 | $2.53 |
| Hy4 previewTencent | $0.834 | $2.501 |
| Amazon Nova 2 LiteAmazon | $0.30 | $2.50 |
| Dola Seed 2.1 TurboByteDance Seed | $0.50 | $2.50 |
| Gemini 2.5 FlashGoogle | $0.30 | $2.50 |
| ERNIE 5.0Baidu | $0.84 | $3.38 |
| ERNIE 4.5 Turbo VLBaidu | $0.42 | $1.27 |
| ERNIE 4.5 Turbo VL (32K)Baidu | $0.42 | $1.27 |
| ERNIE 4.5 Turbo (128K)Baidu | $0.11 | $0.45 |
| ERNIE 4.5 Turbo (32K)Baidu | $0.11 | $0.45 |
Related reading
FAQ
How much does ERNIE 5.1 cost per million tokens?
ERNIE 5.1 costs $0.56 per 1M input tokens and $2.53 per 1M output tokens on Baidu's first-party API, per intl.cloud.baidu.com on October 17, 2026. Prompts over 32,000 tokens are billed at $0.84 input and $3.10 output for the whole request.
What is ERNIE 5.1's context window?
ERNIE 5.1 has a 128,000-token context window and returns up to 65,536 output tokens per response.
Are ERNIE 5.1's weights open?
No. ERNIE 5.1 is a closed-weights model. You call it through Baidu's API as ernie-5.1.
When was ERNIE 5.1 released?
Baidu released ERNIE 5.1 on May 9, 2026.
Sources
Last verified from intl.cloud.baidu.com.
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