Granite 4.2 8B vs Grok 4.5: side-by-side summary

Granite 4.2 8B and Grok 4.5 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 $0.10/M tokens input, $0.15/M tokens output on OpenRouter.

Grok 4.5, from SpaceXAI, has a 500,000-token context window and is priced at $2/M tokens input, $6/M tokens output on OpenRouter.

Context window

• Granite 4.2 8B: 131,072 tokens
• Grok 4.5: 500,000 tokens

Price

• Granite 4.2 8B: $0.10/M tokens input, $0.15/M tokens output
• Grok 4.5: $2/M tokens input, $6/M tokens output

Provided by

• Granite 4.2 8B: ibm-granite
• Grok 4.5: SpaceXAI

• Granite 4.2 8B model details, providers and pricing
• Grok 4.5 model details, providers and pricing