GPT-5.6 Terra vs Inkling: side-by-side summary

GPT-5.6 Terra and Inkling 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 $2/M tokens input, $12/M tokens output on OpenRouter.

Inkling, from thinkingmachines, has a 1,048,576-token context window and is priced at $0.95/M tokens input, $4.05/M tokens output on OpenRouter.

Context window

• GPT-5.6 Terra: 1,050,000 tokens
• Inkling: 1,048,576 tokens

Price

• GPT-5.6 Terra: $2/M tokens input, $12/M tokens output
• Inkling: $0.95/M tokens input, $4.05/M tokens output

Provided by

• GPT-5.6 Terra: OpenAI
• Inkling: thinkingmachines

• GPT-5.6 Terra model details, providers and pricing
• Inkling model details, providers and pricing