ERNIE 5.1 — API Pricing & Benchmarks
ERNIE 5.1 is Baidu's flagship reasoning model, released in 2026-05. The API costs $0.59 per 1M input tokens and $2.65 per 1M output tokens ($1.10 blended at a 3:1 ratio). It supports a 128K-token context window.
Explore provider routes and additional benchmark sources for ERNIE 5.1
| Provider | Baidu |
| Input price / 1M tokens | $0.59 |
| Output price / 1M tokens | $2.65 |
| Cached input / 1M tokens | — |
| Blended price (3:1) | $1.10 |
| Context window | 128K |
| Max output tokens | 66K |
| Knowledge cutoff | — |
| License | proprietary |
| Input modalities | T+I |
| Output speed (tok/s) | — |
| Released | 2026-05 |
| LMArena Elo | 1468 |
| AIME | 99.6%* |
Where ERNIE 5.1 fits
On a blended 3:1 basis ERNIE 5.1 costs $1.10 per 1M tokens, cheaper than 63% of the 80 priced models in this index. As Baidu's flagship it is aimed at the hardest workloads — complex reasoning, agentic coding and multi-step tool use — where output quality dominates cost.
Price history
| Period | Input $/1M | Output $/1M | Cached $/1M |
|---|---|---|---|
| 2026-08-25 → current | $0.59 | $2.65 | — |
No list-price changes recorded since tracking began. Full dataset: price-history.json (CC BY 4.0).
Alternatives at a similar price
- GLM-4.7 (Zhipu AI (Z.ai)) — $1.00/1M blended, AA Index 34.5
- Grok Build 0.1 (xAI) — $1.25/1M blended
- ERNIE 5.0 (Baidu) — $0.97/1M blended, AA Index 22.3
- Gemini 3.5 Flash-Lite (Google) — $0.85/1M blended, AA Index 37.4