GPT-5.6 Terra Pro vs Aion-3.0-Mini: side-by-side summary

GPT-5.6 Terra Pro and Aion-3.0-Mini are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.6 Terra Pro, from OpenAI, has a 1,050,000-token context window and is priced at $1/M tokens input, $6/M tokens output on OpenRouter.

Aion-3.0-Mini, from Aion Labs, has a 131,072-token context window and is priced at $0.70/M tokens input, $1.40/M tokens output on OpenRouter.

Context window

• GPT-5.6 Terra Pro: 1,050,000 tokens
• Aion-3.0-Mini: 131,072 tokens

Price

• GPT-5.6 Terra Pro: $1/M tokens input, $6/M tokens output
• Aion-3.0-Mini: $0.70/M tokens input, $1.40/M tokens output

Provided by

• GPT-5.6 Terra Pro: OpenAI
• Aion-3.0-Mini: Aion Labs

• GPT-5.6 Terra Pro model details, providers and pricing
• Aion-3.0-Mini model details, providers and pricing