Step 3.5 Flash and GLM 4.7 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Step 3.5 Flash, from stepfun, has a 262,144-token context window and is priced at $0.10/M tokens input, $0.30/M tokens output on OpenRouter.
GLM 4.7, from Z.ai, has a 204,800-token context window and is priced at $0.40/M tokens input, $1.75/M tokens output on OpenRouter.