GPT-5 Pro vs all-mpnet-base-v2: side-by-side summary

GPT-5 Pro 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 Pro, from OpenAI, has a 400,000-token context window and is priced at $15/M tokens input, $120/M tokens output on OpenRouter.

all-mpnet-base-v2, from sentence-transformers, has a 512-token context window and is priced at $0.005/M tokens on OpenRouter.

Context window

• GPT-5 Pro: 400,000 tokens
• all-mpnet-base-v2: 512 tokens

Price

• GPT-5 Pro: $15/M tokens input, $120/M tokens output
• all-mpnet-base-v2: $0.005/M tokens

Provided by

• GPT-5 Pro: OpenAI
• all-mpnet-base-v2: sentence-transformers

• GPT-5 Pro model details, providers and pricing
• all-mpnet-base-v2 model details, providers and pricing