High-volume, cost-sensitive work
Choose DeepSeek V4 Flash Vision Exp
DeepSeek V4 Flash Vision Exp costs 28% less on a typical mix of three input tokens for every output token ($0.32 against $0.45 per million tokens).
DeepSeek V4 Flash Vision Exp vs GPT-5.6 Luna: price, context and capabilities
Choose DeepSeek V4 Flash Vision Exp for high-volume, cost-sensitive work, writing and code generation, reused prompts and documents (RAG, agents) and the latest release; on the other points the two are level or the data is missing.
In short
- DeepSeek V4 Flash Vision Exp is 28% cheaper than GPT-5.6 Luna at the headline price ($0.3234 / 1M tokens vs $0.45 / 1M tokens).
- GPT-5.6 Luna reads more per request: 1.05M tokens against 1.05M.
- DeepSeek V4 Flash Vision Exp is the newer model (Aug 21, 2026, against Jul 9, 2026).
- Only GPT-5.6 Luna offers batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose DeepSeek V4 Flash Vision Exp
DeepSeek V4 Flash Vision Exp charges $0.65 per million output tokens, against $1.20 for GPT-5.6 Luna. 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 $0.02 for GPT-5.6 Luna.
Latest release
Choose DeepSeek V4 Flash Vision Exp
DeepSeek V4 Flash Vision Exp is the newer release (Aug 21, 2026, against Jul 9, 2026 for GPT-5.6 Luna).
Monthly cost at three volumes
| Volume | DeepSeek V4 Flash Vision Exp | GPT-5.6 Luna | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $0.38 | $0.50 | DeepSeek V4 Flash Vision Exp, $0.12 less |
| Production: 20M input, 5M output tokens | $7.55 | $10.00 | DeepSeek V4 Flash Vision Exp, $2.45 less |
| Scale: 500M input, 100M output tokens | $172.48 | $220.00 | DeepSeek V4 Flash Vision Exp, $47.52 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| DeepSeek V4 Flash Vision Exp | GPT-5.6 Luna | |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Category | Language models | Language models |
| Status | Preview | Generally available |
| Headline price | $0.3234 / 1M tokens | $0.45 / 1M tokens |
| Input | $0.2156 / 1M tokens | $0.20 / 1M tokens |
| Output | $0.6468 / 1M tokens | $1.20 / 1M tokens |
| Cached input | $0.0069 / 1M tokens | $0.02 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 262k | 128k |
| Released | Aug 21, 2026 | Jul 9, 2026 |
| Knowledge cutoff | No data | February 2026 |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | deepseek-v4-flash-vision-exp | gpt-5.6-luna |
Benchmarks side by side
Leader in bold.
| Benchmark | DeepSeek V4 Flash Vision Exp | GPT-5.6 Luna |
|---|---|---|
| Intelligence Index | No data | 37.3 |
| SciCode | No data | 53.6% |
| GPQA Diamond | No data | 91.1% |
| Humanity's Last Exam | No data | 39.5% |
| MMMU-Pro (visual reasoning) | No data | 78.6% |
| Long-context reasoning (AA-LCR) | No data | 83.7% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose DeepSeek V4 Flash Vision Exp or GPT-5.6 Luna?
Choose DeepSeek V4 Flash Vision Exp for high-volume, cost-sensitive work, writing and code generation, reused prompts and documents (RAG, agents) and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, DeepSeek V4 Flash Vision Exp or GPT-5.6 Luna?
DeepSeek V4 Flash Vision Exp is 28% cheaper than GPT-5.6 Luna at the headline price ($0.3234 / 1M tokens vs $0.45 / 1M tokens).
Which has the larger context window, DeepSeek V4 Flash Vision Exp or GPT-5.6 Luna?
GPT-5.6 Luna reads more per request: 1.05M tokens against 1.05M.
What is the difference between DeepSeek V4 Flash Vision Exp and GPT-5.6 Luna?
DeepSeek V4 Flash Vision Exp is made by DeepSeek and GPT-5.6 Luna by OpenAI. DeepSeek V4 Flash Vision Exp is 28% cheaper than GPT-5.6 Luna at the headline price ($0.3234 / 1M tokens vs $0.45 / 1M tokens). GPT-5.6 Luna reads more per request: 1.05M tokens against 1.05M. DeepSeek V4 Flash Vision Exp is the newer model (Aug 21, 2026, against Jul 9, 2026). Only GPT-5.6 Luna offers batch api.
How much do DeepSeek V4 Flash Vision Exp and GPT-5.6 Luna cost per month?
At 20 million input and 5 million output tokens a month, DeepSeek V4 Flash Vision Exp costs $7.55 and GPT-5.6 Luna costs $10.00, at standard rates.
Which is newer, DeepSeek V4 Flash Vision Exp or GPT-5.6 Luna?
DeepSeek V4 Flash Vision Exp was released on Aug 21, 2026 and GPT-5.6 Luna on Jul 9, 2026.