GPT-5.5 vs GPT-5.6 Luna

Comparing two large language models (llm) models: features, pricing, pros and cons.

	GPT-5.5	GPT-5.6 Luna
Provider	OpenAI	OpenAI
Pricing	$80–400/mo	$20–120/mo
Quality	9.1/10	8.4/10
Speed	8.4/10	9.5/10
Ease of use	8/10	8.5/10
Value	5/10	8/10
Context	256K	256K
Tasks	Text Generation, Chatbots, Coding, Data Analysis, Translation, RAG / Search	Text Generation, Chatbots, Coding, Data Analysis, Translation, RAG / Search
Pros	+ Stable fallback + Cheaper than 5.6 + Proven quality	+ High speed + Low cost + Good for high-volume tasks
Cons	− No longer the top of the lineup	− Weaker than flagships on hard reasoning

GPT-5.5

Previous OpenAI flagship — stable fallback, cheaper than GPT-5.6.

Fastest and cheapest GPT-5.6 tier for light tasks and high throughput.