SIDE BY SIDE
GPT-6.1 Sol vs GPT-6 Luna Pro
Both are GPT models. GPT-6.1 Sol was added to OpenRouter on 2026-09-29, GPT-6 Luna Pro on 2026-09-22.
| Field | GPT-6.1 Sol | GPT-6 Luna Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Family | GPT | GPT |
| Province | The High Peaks | The High Peaks |
| Context window | 1.05M tokens | 1.05M tokens |
| Maximum output | 128K tokens | 128K tokens |
| Input / 1M tokens | $2.00 | $0.100 |
| Output / 1M tokens | $10.0 | $0.500 |
| Accepts | text, files, images | text, files, images |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2026-09-29 | 2026-09-22 |
| Model ID | openai/gpt-6.1-sol | openai/gpt-6-luna-pro |
Questions and answers
Which is cheaper, GPT-6.1 Sol or GPT-6 Luna Pro?
GPT-6 Luna Pro costs less for both input ($0.100 vs $2.00) and output ($0.500 vs $10.0) per million tokens. On input, GPT-6 Luna Pro is 95% cheaper.
Which has the larger context window?
Both have a 1.05M-token context window.
What can one do that the other cannot?
Nothing among reasoning, tool use and image input: both support reasoning, tool use and image input.
Answers are computed from the 2026-10-24 catalog snapshot.