GPT-5.6 Terra vs Grok Build 0.1: side-by-side summary

GPT-5.6 Terra and Grok Build 0.1 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

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

Grok Build 0.1, from SpaceXAI, has a 256,000-token context window and is priced at $1/M tokens input, $2/M tokens output on OpenRouter.

Context window

• GPT-5.6 Terra: 1,050,000 tokens
• Grok Build 0.1: 256,000 tokens

Price

• GPT-5.6 Terra: $1/M tokens input, $6/M tokens output
• Grok Build 0.1: $1/M tokens input, $2/M tokens output

Provided by

• GPT-5.6 Terra: OpenAI
• Grok Build 0.1: SpaceXAI

• GPT-5.6 Terra model details, providers and pricing
• Grok Build 0.1 model details, providers and pricing