Granite 4.2 8B vs GPT-6 Astra Pro: side-by-side summary

Granite 4.2 8B and GPT-6 Astra Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Granite 4.2 8B, from ibm-granite, has a 131,072-token context window and is priced at $0.06/M tokens input, $0.25/M tokens output on OpenRouter.

GPT-6 Astra Pro, from OpenAI, has a 1,050,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

Context window

• Granite 4.2 8B: 131,072 tokens
• GPT-6 Astra Pro: 1,050,000 tokens

Price

• Granite 4.2 8B: $0.06/M tokens input, $0.25/M tokens output
• GPT-6 Astra Pro: $10/M tokens input, $50/M tokens output

Provided by

• Granite 4.2 8B: ibm-granite
• GPT-6 Astra Pro: OpenAI

• Granite 4.2 8B model details, providers and pricing
• GPT-6 Astra Pro model details, providers and pricing