Model comparison

GPT-5.6 Luna vs GPT-5.6 Terra

Compare GPT-5.6 Luna (OpenAI) and GPT-5.6 Terra (OpenAI) by price, context, capabilities, and latency.

Which should you pick?

Price: GPT-5.6 Luna is cheaper ($0.2 / 1M tokens input / $1.20 / 1M tokens output) vs GPT-5.6 Terra ($2 / 1M tokens input / $12 / 1M tokens output).

Side by side

GPT-5.6 Luna vs GPT-5.6 Terra — full comparison

Compare price, provider, context, capabilities, latency, and source basis.

Model	Provider	Input	Output	Context	Capabilities	Best for	Latency	Status	Source
GPT-5.6 Lunaopenai/gpt-5.6-luna	OpenAI	Starting at $0.2 / 1M tokens	$1.20 / 1M tokens	1M	StreamingTool callingJSON modeVision	image understanding, multimodal chat	1396-2773ms	Catalog	Platform curated
GPT-5.6 Terraopenai/gpt-5.6-terra	OpenAI	Starting at $2 / 1M tokens	$12 / 1M tokens	1M	StreamingTool callingJSON modeVision	image understanding, multimodal chat	1534-2908ms	Catalog	Platform curated

FAQ

GPT-5.6 Luna vs GPT-5.6 Terra FAQ

Is GPT-5.6 Luna or GPT-5.6 Terra cheaper?

GPT-5.6 Luna is cheaper ($0.2 / 1M tokens input / $1.20 / 1M tokens output) vs GPT-5.6 Terra ($2 / 1M tokens input / $12 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.

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

Both offer the same context window: 1M tokens.

GPT-5.6 Luna vs GPT-5.6 Terra for Vision: which should I pick?

Both target Vision. Pick GPT-5.6 Luna to optimize cost, or GPT-5.6 Luna for the longer context window. Test both on real prompts before committing production traffic.

GPT-5.6 Luna details GPT-5.6 Terra details Pricing calculator OpenAI-compatible quickstart