GPT-5.1-Codex vs Qwen-Plus
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-5.1-Codex and Qwen-Plus.
GPT-5.1-Codex
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Qwen-Plus
Qwen-Plus, based on the Qwen2.5 foundation model, is a 131K context model with a balanced performance, speed, and cost combination.
Technical Specifications
| Specification | GPT-5.1-Codex | Qwen-Plus |
|---|---|---|
| Provider | OpenAI | Alibaba |
| Context Window | 400,000 tokens | 1,000,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | self hostable |
| Production Stability | stable | beta |
| API Available | Yes | Yes |
| Released Date | 2025-11-13 | 2025-02-01 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.1-Codex
$1.25
Qwen-Plus
$0.26
Output Price per Million Tokens
GPT-5.1-Codex
$10.00
Qwen-Plus
$0.78
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
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-5.1-Codex Quirks & Gotchas
No developer gotchas reported.
Qwen-Plus Quirks & Gotchas
No developer gotchas reported.