GPT-5.5 vs Hunyuan Pro
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 GPT-5.5 and Hunyuan Pro.
GPT-5.5
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
Hunyuan Pro
Hunyuan Pro (混元 Pro) is Tencent's flagship large language model developed by Tencent AI Lab, designed to power AI features across Tencent's vast ecosystem including WeChat, QQ, and enterprise cloud services. It achieves top-tier performance on Chinese-language benchmarks and strong multilingual capabilities, with native support for text, image, and video understanding. Hunyuan Pro is deployed at massive scale across Tencent's advertising, content recommendation, and customer service systems, processing billions of inference requests daily.
Technical Specifications
| Specification | GPT-5.5 | Hunyuan Pro |
|---|---|---|
| Provider | OpenAI | Tencent |
| Context Window | 1,050,000 tokens | 256,000 tokens |
| Agent Suitability | 95/100 | 85/100 |
| Time to First Token (TTFT) | 380 ms | 320 ms |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2026-04-24 | 2025-11-01 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.5
$5.00
Hunyuan Pro
$0.60
Output Price per Million Tokens
GPT-5.5
$30.00
Hunyuan Pro
$1.20
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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.
GPT-5.5 Quirks & Gotchas
- ▸Best for JSON schema adherence — strict mode available via response_format parameter
- ▸Requires explicit tool_choice for deterministic function calling
Hunyuan Pro Quirks & Gotchas
- ▸Massive daily inference volume — battle-tested at WeChat scale
- ▸API available through Tencent Cloud — requires Chinese enterprise account