# DeepSeek V4.1 Flash vs DeepSeek V4 Pro

DeepSeek V4.1 Flash is the cheaper of the 2: for the same tokens, 3 read for each 1 written, DeepSeek V4 Pro costs 3.8 times as much. Below are both price lists, what 8 everyday jobs cost a month on each, and how many tokens the same text takes on each, which can change the answer.

- Page, with a calculator for your own job: https://tecyfy.com/prices/compare/deepseek-flash-vs-deepseek-v4-pro
- Makers: DeepSeek V4.1 Flash from DeepSeek, DeepSeek V4 Pro from DeepSeek

## Price per million tokens, in US dollars

| | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
| --- | --: | --: |
| Input | $0.30 | $1.32 |
| Cached input | $0.006 | $0.044 |
| Cache write | not listed | not listed |
| Output | $1.20 | $3.96 |
| Blend, 3 read for each 1 written | $0.525 | $1.98 |
| Batch input | not listed | not listed |
| Batch output | not listed | not listed |
| Context window, tokens | 1M | 1M |
| Capability score (Epoch Capabilities Index; GPT-5 is 150) | 156 | 155 |
| Longest answer, tokens | not listed | not listed |

DeepSeek V4.1 Flash: The peak-hours price. Off-peak hours are half. Peak is 01:00 to 04:00 and 06:00 to 10:00 UTC on weekdays.

DeepSeek V4 Pro: The peak-hours price. Off-peak hours are half. Peak is 01:00 to 04:00 and 06:00 to 10:00 UTC on weekdays.

## What 8 everyday jobs cost a month on each

Each job at its usual runs a day, for 30 days, at the standard price.

| Job | Tokens in, out, runs a day | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
| --- | --- | --: | --: |
| A chat question | 300, 500, 100 | $2.07 | $7.13 |
| A hard question, with thinking | 300, 1,400, 100 | $5.31 | $17.82 |
| A long report, summarised | 60,000, 2,000, 20 | $12.24 | $52.27 |
| A 40-turn agent task | 2,800,000, 40,000, 10 | $44.14 | $192 |
| A support bot's reply | 4,000, 300, 2,000 | $58.32 | $235 |
| Sort a message into a category | 250, 5, 50,000 | $122 | $525 |
| Read an invoice into fields | 1,500, 250, 1,000 | $22.50 | $89.10 |
| Review a pull request | 25,000, 4,500, 50 | $19.35 | $76.23 |

## Questions

### Which is cheaper, DeepSeek V4.1 Flash or DeepSeek V4 Pro?

DeepSeek V4.1 Flash is cheaper: $0.30 per million tokens read and $1.20 per million written, against $1.32 and $3.96 on DeepSeek V4 Pro. On a mix of 3 tokens read for each 1 written, DeepSeek V4 Pro costs 3.8 times as much.

### Which is better, DeepSeek V4.1 Flash or DeepSeek V4 Pro?

They cannot be told apart on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks: DeepSeek V4.1 Flash scores 156 and DeepSeek V4 Pro 155, within the range of doubt around each (GPT-5 is 150). So choose on price and on 10 tasks of your own.

### What does a support bot cost a month on DeepSeek V4.1 Flash and DeepSeek V4 Pro?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, it costs $58.32 a month on DeepSeek V4.1 Flash and $235 on DeepSeek V4 Pro: DeepSeek V4 Pro costs 4 times as much for this job.

### What does an AI agent task cost on DeepSeek V4.1 Flash and DeepSeek V4 Pro?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs 15 cents on DeepSeek V4.1 Flash and 64 cents on DeepSeek V4 Pro. At 10 tasks a day that is $44.14 and $192 a month.

### Which has the larger context window, DeepSeek V4.1 Flash or DeepSeek V4 Pro?

Neither: both hold 1M tokens at once, about 1,500 pages of English text.

### Does the same text take the same number of tokens on DeepSeek V4.1 Flash and DeepSeek V4 Pro?

Yes, both are counted the same way: our lesson "How AI writes", 1,700 words long, is 2,063 tokens on each.

### Can I pay less on DeepSeek V4.1 Flash and DeepSeek V4 Pro for work that can wait?

Not with a batch price: neither maker's price page lists one for these models. A cache still lowers the price of text the model reads again.

## Sources

- [DeepSeek: API prices](https://api-docs.deepseek.com/quick_start/pricing)
- [Epoch Capabilities Index, by Epoch AI (CC BY 4.0)](https://epoch.ai/benchmarks/eci)

## Other comparisons

- [DeepSeek V4.1 Flash vs GPT-6 Luna](https://tecyfy.com/prices/compare/deepseek-flash-vs-gpt-6-luna.md)
- [Claude Haiku 5.5 vs DeepSeek V4.1 Flash](https://tecyfy.com/prices/compare/claude-haiku-5-5-vs-deepseek-flash.md)
- [DeepSeek V4.1 Flash vs Qwen3.8-Flash](https://tecyfy.com/prices/compare/deepseek-flash-vs-qwen3-8-flash.md)
- [GPT-6 Astra vs DeepSeek V4 Pro](https://tecyfy.com/prices/compare/deepseek-v4-pro-vs-gpt-6-astra.md)
- [GPT-6 Astra vs DeepSeek V4.1 Flash](https://tecyfy.com/prices/compare/deepseek-flash-vs-gpt-6-astra.md)
- [GPT-6.1 Sol vs DeepSeek V4 Pro](https://tecyfy.com/prices/compare/deepseek-v4-pro-vs-gpt-6-1-sol.md)