GPT-5.6 Luna vs GPT-5.6 Terra: API price and specs

GPT-5.6 Luna is 90% cheaper than GPT-5.6 Terra on input price.

GPT-5.6 Luna is 70% cheaper than GPT-5.6 Terra on output price.

GPT-5.6 Luna is 84% cheaper than GPT-5.6 Terra on a 1M-in / 200k-out workload.

Field	GPT-5.6 Luna	GPT-5.6 Terra
Lowest input, per 1M	$0.10	$1.00 +900%
Median input, per 1M	$0.20	$2.00 +900%
Lowest output, per 1M	$0.60	$2.00 +233.3%
Median output, per 1M	$1.20	$12.00 +900%
Lowest unit price	—	$0.001 / request
Cost of 1M in + 200k out	$0.22	$1.40 +536.4%
Context	1.1M	1.1M
Max output	128K	128K
Providers	28	28
Regions	EU, GLOBAL, IN, US	EU, GLOBAL, IN, US
Accepts	application/pdf, file, image, image/gif, image/jpeg, image/png, image/webp, pdf, text	application/pdf, file, image, image/gif, image/jpeg, image/png, image/webp, pdf, text
Returns	text	text
Type	Text models	Text models
Free option	no	no
Cheapest provider	openrouter	openrouter

Your own workload: how many tokens the model gets (input) and gives back (output) - for example, in a month. The "Cost" row of the table above is recalculated for these numbers, for each model.

Computed from current offers each time the page opens; the best value of a row is bold, the percent is how far behind the best.

Providers selling both

302ai, abacus, aihubmix, amazon-bedrock, azure, azure-cognitive-services, cortecs, digitalocean, edenai, fastrouter, github-copilot, impossibl, jiekou, kenari, kilo, ofox, openai, opencode, openrouter, orcarouter, perplexity-agent, requesty, standardcompute, trustedrouter, vercel, zenmux

Frequently asked questions

Which is cheaper, GPT-5.6 Luna or GPT-5.6 Terra?

GPT-5.6 Luna is 90% cheaper than GPT-5.6 Terra on input price. GPT-5.6 Luna is 70% cheaper than GPT-5.6 Terra on output price. GPT-5.6 Luna is 84% cheaper than GPT-5.6 Terra on a 1M-in / 200k-out workload.

Which has the larger context, GPT-5.6 Luna or GPT-5.6 Terra?

GPT-5.6 Luna: 1.1M tokens; GPT-5.6 Terra: 1.1M tokens.

Where can I use both GPT-5.6 Luna and GPT-5.6 Terra?