DeepSeek V4 Flash VS GPT-5.6 Luna
DeepSeek · OpenAI · AI Models · Updated Jul 26, 2026
Side-by-Side Breakdown
| Feature | DeepSeek V4 Flash | GPT-5.6 Luna | Winner |
|---|---|---|---|
| Input Price | $0.140/1M tkns | $1.00/1M tkns | ✓ DeepSeek V4 Flash |
| Output Price | $0.280/1M tkns | $6.00/1M tkns | ✓ DeepSeek V4 Flash |
| Provider | DeepSeek | OpenAI | — |
| Category | ai-model | ai-model | — |
| context window | 1048576 | 1050000 | |
| modalities | text->text | text+image+file->text | |
| vision | false | true | |
| Overall Winner | 🏆 | DeepSeek V4 Flash |
DeepSeek V4 Flash vs GPT-5.6 Luna: Quick Summary
DeepSeek V4 Flash is the more affordable choice. DeepSeek V4 Flash costs $0.140/1M tkns vs GPT-5.6 Luna at $1.00/1M tkns (Input Price). DeepSeek V4 Flash is 86.0% cheaper. Pricing verified as of Jul 26, 2026 — always confirm on the provider's official pricing page before committing.
DeepSeek V4 Flash vs GPT-5.6 Luna: Full Pricing Analysis
On headline price, DeepSeek V4 Flash is the cheaper option: $0.140/1M tkns versus $1.00/1M tkns for GPT-5.6 Luna (Input Price) — about 86% less. At a scale of one million per 1M tokens, that difference works out to roughly $140.00 with DeepSeek V4 Flash against $1,000.00 with GPT-5.6 Luna. For high-volume workloads that gap compounds quickly, so if your usage is predictable and large, DeepSeek V4 Flash is the more economical default.
Price isn’t the whole story, though. GPT-5.6 Luna (OpenAI) sits at the higher price point, which is often justified by broader features, stronger delivery/SLA guarantees, or a more mature developer experience. If you need those capabilities, the premium can pay for itself. Choose DeepSeek V4 Flash when cost-per-unit is the priority and your requirements are straightforward; choose GPT-5.6 Luna when reliability, tooling, or ecosystem fit matter more than shaving the per-unit rate.
Beyond price, the two differ on context window (1048576 vs 1050000), modalities (text->text vs text+image+file->text) and vision (false vs true). Check those specs against your actual requirements before committing — the cheaper option is only the better deal if it also meets your technical needs.
Pricing shown is Input Price as published by each provider and verified Jul 26, 2026. Providers change prices and introduce free tiers and volume discounts frequently — always confirm the current rate on DeepSeek’s and OpenAI’s official pricing pages before you commit.