High-volume, cost-sensitive work
Choose GPT-6 Luna Pro
GPT-6 Luna Pro costs 38% less on a typical mix of three input tokens for every output token ($0.20 against $0.32 per million tokens).
DeepSeek V4 Flash Vision Exp vs GPT-6 Luna Pro: price, context and capabilities
Choose DeepSeek V4 Flash Vision Exp for reused prompts and documents (RAG, agents). Choose GPT-6 Luna Pro for high-volume, cost-sensitive work, writing and code generation and the latest release.
In short
- GPT-6 Luna Pro is 38% cheaper than DeepSeek V4 Flash Vision Exp at the headline price ($0.20 / 1M tokens vs $0.3234 / 1M tokens).
- GPT-6 Luna Pro reads more per request: 1.05M tokens against 1.05M.
- GPT-6 Luna Pro is the newer model (Sep 22, 2026, against Aug 21, 2026).
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose GPT-6 Luna Pro
GPT-6 Luna Pro charges $0.50 per million output tokens, against $0.65 for DeepSeek V4 Flash Vision Exp. Output dominates the bill when answers are long.
Reused prompts and documents (RAG, agents)
Choose DeepSeek V4 Flash Vision Exp
DeepSeek V4 Flash Vision Exp charges <$0.01 per million cached input tokens, against $0.01 for GPT-6 Luna Pro.
Latest release
Choose GPT-6 Luna Pro
GPT-6 Luna Pro is the newer release (Sep 22, 2026, against Aug 21, 2026 for DeepSeek V4 Flash Vision Exp).
Monthly cost at three volumes
| Volume | DeepSeek V4 Flash Vision Exp | GPT-6 Luna Pro | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $0.38 | $0.23 | GPT-6 Luna Pro, $0.15 less |
| Production: 20M input, 5M output tokens | $7.55 | $4.50 | GPT-6 Luna Pro, $3.05 less |
| Scale: 500M input, 100M output tokens | $172.48 | $100.00 | GPT-6 Luna Pro, $72.48 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| DeepSeek V4 Flash Vision Exp | GPT-6 Luna Pro | |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Category | Language models | Language models |
| Status | Preview | Generally available |
| Headline price | $0.3234 / 1M tokens | $0.20 / 1M tokens |
| Input | $0.2156 / 1M tokens | $0.10 / 1M tokens |
| Output | $0.6468 / 1M tokens | $0.50 / 1M tokens |
| Cached input | $0.0069 / 1M tokens | $0.01 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 262k | 128k |
| Released | Aug 21, 2026 | Sep 22, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | deepseek-v4-flash-vision-exp | gpt-6-luna-pro |
Frequently asked questions
Should I choose DeepSeek V4 Flash Vision Exp or GPT-6 Luna Pro?
Choose DeepSeek V4 Flash Vision Exp for reused prompts and documents (RAG, agents). Choose GPT-6 Luna Pro for high-volume, cost-sensitive work, writing and code generation and the latest release.
Which is cheaper, DeepSeek V4 Flash Vision Exp or GPT-6 Luna Pro?
GPT-6 Luna Pro is 38% cheaper than DeepSeek V4 Flash Vision Exp at the headline price ($0.20 / 1M tokens vs $0.3234 / 1M tokens).
Which has the larger context window, DeepSeek V4 Flash Vision Exp or GPT-6 Luna Pro?
GPT-6 Luna Pro reads more per request: 1.05M tokens against 1.05M.
What is the difference between DeepSeek V4 Flash Vision Exp and GPT-6 Luna Pro?
DeepSeek V4 Flash Vision Exp is made by DeepSeek and GPT-6 Luna Pro by OpenAI. GPT-6 Luna Pro is 38% cheaper than DeepSeek V4 Flash Vision Exp at the headline price ($0.20 / 1M tokens vs $0.3234 / 1M tokens). GPT-6 Luna Pro reads more per request: 1.05M tokens against 1.05M. GPT-6 Luna Pro is the newer model (Sep 22, 2026, against Aug 21, 2026).
How much do DeepSeek V4 Flash Vision Exp and GPT-6 Luna Pro cost per month?
At 20 million input and 5 million output tokens a month, DeepSeek V4 Flash Vision Exp costs $7.55 and GPT-6 Luna Pro costs $4.50, at standard rates.
Which is newer, DeepSeek V4 Flash Vision Exp or GPT-6 Luna Pro?
GPT-6 Luna Pro was released on Sep 22, 2026 and DeepSeek V4 Flash Vision Exp on Aug 21, 2026.