Qwen3.7 Plus and Mistral Small 4 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Qwen3.7 Plus, from Qwen, has a 1,000,000-token context window and is priced at $0.32/M tokens input, $1.28/M tokens output on OpenRouter.
Mistral Small 4, from Mistral AI, has a 262,144-token context window and is priced at $0.15/M tokens input, $0.60/M tokens output on OpenRouter.