Effective price spreads the monthly fee over 1M tokens; API prices are the vendor's own metered rate for a 3:1 input:output blend. Plan fees are list prices verified 2026-09-13.
4 flat-rate subscription plans include GPT-5.6 Terra: GitHub Copilot Pro, GitHub Copilot Pro+, OpenAI ChatGPT Pro (5x) and OpenAI ChatGPT Pro (20x). As of Oct 4, 2026, the cheapest is GitHub Copilot Pro at $10 a month — $10 per 1M tokens at 1M tokens a month, and cheaper still at higher usage. Metered GPT-5.6 Terra pricing is $4.5 per 1M tokens on a 3:1 input:output blend, so this plan is the cheaper option above 2.2M tokens a month.
Plans that include GPT-5.6 Terra
Flat-rate plans that include GPT-5.6 Terra, in USD per month, updated Oct 4, 2026