head-to-head
DeepSeek: DeepSeek V4.1 Flash vs OpenAI: GPT-5.6 Luna Pro (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| DeepSeek: DeepSeek V4.1 Flash | OpenAI: GPT-5.6 Luna Pro (batch) | |
|---|---|---|
| Vendor | deepseek | openai |
| Quality Score | 100 | 100 |
| Input Price | $0.05/M | $0.10/M |
| Output Price | $0.57/M | $0.60/M |
| Context Window | 1,048,576 | 1,050,000 |
| Max Output | 943,718 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, DeepSeek V4.1 Flash costs $0.19 and GPT-5.6 Luna Pro (batch) costs $0.25, so DeepSeek V4.1 Flash is about 1.3 times cheaper for the same work.
Both take in a similar amount of text: 1,048,576 and 1,050,000 tokens, about 1,573 and 1,575 pages.
DeepSeek V4.1 Flash was released in September 2026 and GPT-5.6 Luna Pro (batch) in July 2026.
Pick DeepSeek V4.1 Flash if you need lower cost.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Related comparisons
Anthropic: Claude Haiku 5.5 (batch) vs DeepSeek: DeepSeek V4.1 Flash
Anthropic: Claude Haiku 5.5 vs DeepSeek: DeepSeek V4.1 Flash
Anthropic: Claude Opus 5.5 (batch) vs DeepSeek: DeepSeek V4.1 Flash
Anthropic: Claude Opus 5 (batch) vs OpenAI: GPT-5.6 Luna Pro (batch)
Anthropic: Claude Sonnet 5.5 (batch) vs DeepSeek: DeepSeek V4.1 Flash
Anthropic: Claude Sonnet 5.5 vs DeepSeek: DeepSeek V4.1 Flash
ByteDance Seed: Seed-2.0-Code vs OpenAI: GPT-5.6 Luna Pro (batch)
ByteDance Seed: Seed 2.1 Turbo vs OpenAI: GPT-5.6 Luna Pro (batch)