Rnj 1 Instruct vs GPT-5.1-Codex-Mini: side-by-side summary

Rnj 1 Instruct and GPT-5.1-Codex-Mini are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

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

GPT-5.1-Codex-Mini, from OpenAI, has a 400,000-token context window and is priced at $0.25/M tokens input, $2/M tokens output on OpenRouter.

Context window

• Rnj 1 Instruct: 32,768 tokens
• GPT-5.1-Codex-Mini: 400,000 tokens

Price

• Rnj 1 Instruct: Pricing varies by provider
• GPT-5.1-Codex-Mini: $0.25/M tokens input, $2/M tokens output

Provided by

• Rnj 1 Instruct: essentialai
• GPT-5.1-Codex-Mini: OpenAI

• Rnj 1 Instruct model details, providers and pricing
• GPT-5.1-Codex-Mini model details, providers and pricing