SIDE BY SIDE
GPT-4.1 vs GPT-5.6 Luna
Both are GPT models. GPT-5.6 Luna was added to OpenRouter on 2026-07-09, GPT-4.1 on 2025-04-14.
| Field | GPT-4.1 | GPT-5.6 Luna |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Family | GPT | GPT |
| Province | Snow Country | Snow Country |
| Context window | 1.05M tokens | 1.05M tokens |
| Maximum output | 33K tokens | 128K tokens |
| Input / 1M tokens | $2.00 | $0.200 |
| Output / 1M tokens | $8.00 | $1.20 |
| Accepts | text, files, images | text, files, images |
| Produces | text | text |
| Reasoning | No | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2025-04-14 | 2026-07-09 |
| Model ID | openai/gpt-4.1 | openai/gpt-5.6-luna |
Questions and answers
Which is cheaper, GPT-4.1 or GPT-5.6 Luna?
GPT-5.6 Luna costs less for both input ($0.200 vs $2.00) and output ($1.20 vs $8.00) per million tokens. On input, GPT-5.6 Luna is 90% cheaper.
Which has the larger context window?
GPT-5.6 Luna: 1.05M tokens against 1.05M for GPT-4.1 (1× as long).
What can one do that the other cannot?
Only GPT-5.6 Luna supports reasoning.
Answers are computed from the 2026-10-24 catalog snapshot.