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All comparisons · Prices checked 2026-10-01
DeepSeek V4 Flash vs GPT-6 Luna: API cost comparison
For a typical chatbot reply, DeepSeek V4 Flash costs $0.0009 and GPT-6 Luna costs $0.0003 per request: GPT-6 Luna is 2.7× cheaper. GPT-6 Luna is cheaper in every workload below.
API prices
| DeepSeek V4 Flash | GPT-6 Luna | |
|---|---|---|
| Maker | DeepSeek | OpenAI |
| Input / 1M tokens | $0.3 | $0.1 |
| Output / 1M tokens | $1.2 | $0.5 |
| Output vs input price | 4.0× | 5.0× |
| Context window | 1M tokens | 922K tokens |
| Tokens for the same English text | baseline (GPT o200k count) | baseline (GPT o200k count) |
Cost by workload
| Workload (per 1,000 requests) | DeepSeek V4 Flash | GPT-6 Luna | Cheaper |
|---|---|---|---|
| Chatbot reply short question plus some chat history · 1,500 in / 400 out | $0.930 | $0.350 | GPT-6 Luna 2.7× cheaper |
| Document Q&A (RAG) retrieved passages plus a question · 8,000 in / 500 out | $3.00 | $1.05 | GPT-6 Luna 2.9× cheaper |
| Coding agent step large working context, short edit · 25,000 in / 800 out | $8.46 | $2.90 | GPT-6 Luna 2.9× cheaper |
| Summarize a long report long input, short summary · 20,000 in / 300 out | $6.36 | $2.15 | GPT-6 Luna 3.0× cheaper |
| Write an article short brief, long draft · 800 in / 2,000 out | $2.64 | $1.08 | GPT-6 Luna 2.4× cheaper |
GPT-6 Luna is cheaper on both input and output, so it costs less for every kind of request. The gap is 3.0× on input and 2.4× on output.
Monthly cost
| Monthly volume | DeepSeek V4 Flash | GPT-6 Luna |
|---|---|---|
| 10,000 chatbot replies / month | $9.30 | $3.50 |
| 100,000 chatbot replies / month | $93.00 | $35.00 |
| 1,000,000 chatbot replies / month | $930 | $350 |
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Token counts are for English text measured with GPT's tokenizer; each model's own tokenizer difference is applied automatically.
Questions
Which is cheaper, DeepSeek V4 Flash or GPT-6 Luna?
For a typical chatbot reply (1,500 input and 400 output tokens), DeepSeek V4 Flash costs $0.0009 and GPT-6 Luna costs $0.0003 per request, so GPT-6 Luna is 2.7× cheaper. GPT-6 Luna is cheaper in every workload below.
How much do DeepSeek V4 Flash and GPT-6 Luna cost per million tokens?
DeepSeek V4 Flash costs $0.3 per 1M input tokens and $1.2 per 1M output tokens. GPT-6 Luna costs $0.1 input and $0.5 output. Prices checked 2026-10-01.
Do both models count the same text as the same number of tokens?
No. Each model family has its own tokenizer, so the same text can be a different number of tokens. The costs on this page already include that difference (estimated from GPT's tokenizer).
Related comparisons
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Open the token counter →Standard API list prices, short-context tier, no caching or batch discounts. Prices change; check each provider's pricing page before large jobs.