DeepSeek-V4-Flash-Vision-Exp vs GPT-5.6 Luna: Specs & Benchmark Comparison
DeepSeek-V4-Flash-Vision-Exp is developed by DeepSeek, while GPT-5.6 Luna comes from OpenAI. GPT-5.6 Luna was released in July 2026, and DeepSeek-V4-Flash-Vision-Exp followed a month later in August 2026.
The two models share 4 published benchmarks. GPT-5.6 Luna leads on 3 of them, DeepSeek-V4-Flash-Vision-Exp on 1. The widest gaps are on Agents' Last Exam, where GPT-5.6 Luna scores 50.3% against 27.3%; AutomationBench, where DeepSeek-V4-Flash-Vision-Exp scores 25.7% against 14.9%. Averaged across everything we track, DeepSeek-V4-Flash-Vision-Exp sits at 50.4% and GPT-5.6 Luna at 51.5%.
On price the two are close: DeepSeek-V4-Flash-Vision-Exp costs $0.22 per million input tokens and $0.66 per million output tokens, GPT-5.6 Luna $0.20 and $1.20. Both accept a context window of about 1M tokens. Both accept text and images as input. On tooling, only GPT-5.6 Luna supports function calling and only GPT-5.6 Luna offers structured output.
| Characteristic | DeepSeek-V4-Flash-Vision-Exp | GPT-5.6 Luna |
|---|---|---|
| Company | DeepSeek | OpenAI |
| Release Date | August 21, 2026 | July 9, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 393K | 128K |
| Input Price / 1M | $0.22 | $0.20 |
| Output Price / 1M | $0.66 | $1.20 |
| Average Score | 50.4% | 51.5% |
| Benchmarks | ||
| Agents' Last Exam | 27.3% | 50.3% |
| AutomationBench | 25.7% | 14.9% |
| DeepSWE | 59.3% | 67.2% |
| Terminal-Bench 2.1 | 83.9% | 84.7% |
Visual Benchmark Comparison
Verdict
DeepSeek-V4-Flash-Vision-Exp leads in 2 out of 4 comparison categories.
Both models show comparable average scores: DeepSeek-V4-Flash-Vision-Exp — 0.5, GPT-5.6 Luna — 0.5.
DeepSeek-V4-Flash-Vision-Exp is 1.6x cheaper: input $0.22/1M vs $0.20/1M tokens.
GPT-5.6 Luna supports a larger context: 1M vs 1M tokens.
DeepSeek-V4-Flash-Vision-Exp is newer: released 8/21/2026 vs 7/9/2026.
More About These Models
Frequently Asked Questions
Which is better for coding — DeepSeek-V4-Flash-Vision-Exp or GPT-5.6 Luna?
Which model is cheaper — DeepSeek-V4-Flash-Vision-Exp or GPT-5.6 Luna?
Which has a larger context window — DeepSeek-V4-Flash-Vision-Exp or GPT-5.6 Luna?
The DeepSeek-V4-Flash-Vision-Exp and GPT-5.6 Luna comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the DeepSeek-V4-Flash-Vision-Exp or GPT-5.6 Luna page. See also the complete list of AI model comparisons.