Overview
GPT-5.1 Chat vs all-mpnet-base-v2: side-by-side summary
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.
- Context window
- GPT-5.1 Chat: 128,000 tokens
- all-mpnet-base-v2: Not applicable
- Price
- GPT-5.1 Chat: Pricing varies by provider
- all-mpnet-base-v2: $0.005/M tokens
- Provided by
- GPT-5.1 Chat: OpenAI
- all-mpnet-base-v2: sentence-transformers