DeepSeek-V3.1 vs GPT-5.6 Luna
Price and specs side by side · USD per 1M tokens · verified 2026-10-11
// side by side
| metric | DeepSeek-V3.1 | GPT-5.6 Luna |
|---|
| input / 1M | $0.25 | $0.20 |
| output / 1M | $0.95 | $1.20 |
| blended (3:1) | $0.425 | $0.45 |
| cache read / 1M | $0.13 | $0.02 |
| context | 163.8K | 1.05M |
| max output | 8.2K | 128K |
| input types | text | text · image · pdf |
| reasoning | yes | yes |
| tool calling | yes | yes |
| structured output | yes | yes |
| open weights | yes | no |
| released | 2025-08-21 | 2026-07-09 |
| knowledge cutoff | n/a | 2026-02-16 |
| lab | DeepSeek | OpenAI |
// monthly cost scenarios
| workload | tokens in / out | DeepSeek-V3.1 | GPT-5.6 Luna |
|---|
| Chatbot | 10M / 2M | $4.40 | $4.40 |
| RAG app | 50M / 5M | $17.25 | $16.00 |
| Coding agent | 20M / 10M | $14.50 | $16.00 |
// verdict
- DeepSeek-V3.1 is 5.6% cheaper than GPT-5.6 Luna on a blended 3:1 input/output basis.
- GPT-5.6 Luna has the larger context window (1.05M vs 163.8K tokens).
- Only GPT-5.6 Luna accepts image input.