How much does an AI writing tool cost on DeepSeek V4 Flash 0423?
Running a copywriting / email-drafting tool with long outputs on DeepSeek V4 Flash 0423 costs about $37.01/month for 800 users × 6 messages/day: that's $0.046 per user and $0.26 per 1,000 requests.
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Assumptions
- 800 users × 6 messages/day (144,000 per month)
- System prompt 1,200 tokens, user input 400, output 900 tokens
- Prompt cache hit rate 60%
- DeepSeek V4 Flash 0423 list price: $0.091/1M input, $0.182/1M output, $0.0182/1M cached input; context window 1,048,576 tokens
How DeepSeek V4 Flash 0423 compares for an AI writing tool
DeepSeek V4 Flash 0423 is the cheapest of the 15 popular models we track for this workload. Cheapest isn't always best: check the quality index, and consider routing easy requests to a cheap model and only hard ones to a frontier model.
| Model | Quality | Monthly | Per user |
|---|---|---|---|
| DeepSeek V4 Flash 0423 | 24.4 | $37.01 | $0.046 |
| GPT-5 Nano | 13 | $58.69 | $0.073 |
| Gemini 2.5 Flash Lite | 10.4 | $64.40 | $0.080 |
| Claude Haiku 5.5 | 43.4 | $80.24 | $0.10 |
| Llama 4 Maverick | 9.3 | $114 | $0.14 |
| DeepSeek V4 Pro 0423 | 30.4 | $153 | $0.19 |
| Grok 4.3 | 24.9 | $503 | $0.63 |
| Gemini 3.8 Flash | 40.9 | $594 | $0.74 |
| GPT-5.4 Mini | 24.1 | $686 | $0.86 |
| Grok 4.7 | 46.4 | $1,083 | $1.35 |
| Gemini 4 Argon | 52.6 | $1,435 | $1.79 |
| GPT-6.1 Sol | 51.8 | $1,594 | $1.99 |
| Claude Sonnet 5.5 | 56 | $1,594 | $1.99 |
| Claude Opus 5.5 | 57.6 | $3,189 | $3.99 |
| GPT-5.5 | 38.4 | $4,573 | $5.72 |
More DeepSeek V4 Flash 0423 cost guides
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Prices: OpenRouter list prices (USD per 1M tokens), updated 2026-10-15. Estimates only; a month is 30 days. See how the math works.