Nova 2 Lite and gpt-oss-safeguard-20b are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Nova 2 Lite, from Amazon, has a 1,000,000-token context window and is priced at $0.30/M tokens input, $2.50/M tokens output on OpenRouter.
gpt-oss-safeguard-20b, from OpenAI, has a 131,072-token context window and is priced at $0.075/M tokens input, $0.30/M tokens output on OpenRouter.