Claude Opus 5 (Fast) and WizardLM-2 8x22B are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Opus 5 (Fast), from Anthropic, has a 1,000,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.
WizardLM-2 8x22B, from Microsoft, has a 65,535-token context window and is priced at $0.62/M tokens input, $0.62/M tokens output on OpenRouter.