Inkling Small and Step 3.7 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Inkling Small, from thinkingmachines, has a 1,048,576-token context window and is priced at $0.45/M tokens input, $1.20/M tokens output on OpenRouter.
Step 3.7 Flash, from stepfun, has a 262,144-token context window and is priced at $0.20/M tokens input, $1.15/M tokens output on OpenRouter.