Claude Opus 4.5 vs Rnj 1 Instruct: side-by-side summary

Claude Opus 4.5 and Rnj 1 Instruct 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.

Rnj 1 Instruct, from essentialai, has a 32,768-token context window and is priced by the provider serving it on OpenRouter.

Context window

• Claude Opus 4.5: 200,000 tokens
• Rnj 1 Instruct: 32,768 tokens

Price

• Claude Opus 4.5: $5/M tokens input, $25/M tokens output
• Rnj 1 Instruct: Pricing varies by provider

Provided by

• Claude Opus 4.5: Anthropic
• Rnj 1 Instruct: essentialai

• Claude Opus 4.5 model details, providers and pricing
• Rnj 1 Instruct model details, providers and pricing