Compare GPT-5.1 Chat from OpenAI and all-mpnet-base-v2 from sentence-transformers on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
GPT-5.1 Chat and all-mpnet-base-v2 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT-5.1 Chat, from OpenAI, has a 128,000-token context window and is priced by the provider serving it on OpenRouter.
all-mpnet-base-v2, from sentence-transformers, is priced at $0.005/M tokens on OpenRouter.
| GPT-5.1 Chat | all-mpnet-base-v2 | |
|---|---|---|
| Input price | Pricing varies by provider | Not applicable |
| Output price | Pricing varies by provider | Not applicable |
| Context window | 128,000 tokens | Not applicable |
| Intelligence Index | Not available | Not available |
| Coding Index | Not available | Not available |
| Agentic Index | Not available | Not available |
| Latency (p50) | Not available | Not available |
| Throughput (p50) | Not available | Not available |