Claude Opus 4.5 and GTE-Large are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Opus 4.5, from Anthropic, has a 200,000-token context window and is priced at $5/M tokens input, $25/M tokens output on OpenRouter.
GTE-Large, from thenlper, has a 512-token context window and is priced at $0.01/M tokens on OpenRouter.