Claude Sonnet 4.5 vs ERNIE 4.0
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Sonnet 4.5 and ERNIE 4.0.
Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
ERNIE 4.0
ERNIE 4.0 (文心一言 4.0) is Baidu's most advanced large language model, representing the culmination of Baidu's decades of search and NLP expertise. Built on Baidu's proprietary knowledge-enhanced pre-training architecture, ERNIE 4.0 integrates deep understanding of Chinese language, culture, and domain-specific knowledge. It achieves GPT-4-class performance on comprehensive Chinese-language benchmarks spanning language understanding, reasoning, mathematics, and code generation. ERNIE 4.0 powers Baidu's Wenxin Yiyan consumer chatbot and is available via Baidu AI Cloud API for enterprise integrations.
Technical Specifications
| Specification | Claude Sonnet 4.5 | ERNIE 4.0 |
|---|---|---|
| Provider | Anthropic | Baidu |
| Context Window | 1,000,000 tokens | 128,000 tokens |
| Agent Suitability | 91/100 | 87/100 |
| Time to First Token (TTFT) | 380 ms | 380 ms |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-09-29 | 2025-08-30 |
API Pricing Comparison
Input Price per Million Tokens
Claude Sonnet 4.5
$3.00
ERNIE 4.0
$1.20
Output Price per Million Tokens
Claude Sonnet 4.5
$15.00
ERNIE 4.0
$2.40
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Claude Sonnet 4.5 Quirks & Gotchas
- ▸Excellent for long-form writing and nuanced document analysis
- ▸Slightly slower than Sonnet 4.6 — upgrade for production agentic use
ERNIE 4.0 Quirks & Gotchas
- ▸Superior Chinese-language understanding — best-in-class for China-market applications
- ▸API requires Baidu Cloud account with Chinese phone verification