# DeepSeek V4 Pro vs GPT-6.1 Sol

DeepSeek V4 Pro is the cheaper of the 2: for the same tokens, 3 read for each 1 written, GPT-6.1 Sol costs 2 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-v4-pro-vs-gpt-6-1-sol
- Makers: DeepSeek V4 Pro from DeepSeek, GPT-6.1 Sol from OpenAI

## Price per million tokens, in US dollars

| | DeepSeek V4 Pro | GPT-6.1 Sol |
| --- | --: | --: |
| Input | $1.32 | $2 |
| Cached input | $0.044 | $0.10 |
| Cache write | not listed | $2.50 |
| Output | $3.96 | $10 |
| Blend, 3 read for each 1 written | $1.98 | $4 |
| Batch input | not listed | $1 |
| Batch output | not listed | $5 |
| Long prompt input (above 272K on GPT-6.1 Sol) | $1.32 | $4 |
| Long prompt output | $3.96 | $15 |
| Context window, tokens | 1M | 1.05M |
| Capability score (Epoch Capabilities Index; GPT-5 is 150) | 155 | 166 |
| Longest answer, tokens | not listed | 128K |

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.

## The same text, counted by each maker

Our lesson "How AI writes" (https://tecyfy.com/learn/how-ai-works/how-ai-writes), about 1,700 words of English:

- DeepSeek V4 Pro: 2,063 tokens. Counted with the tokenizer DeepSeek publishes with V4-Pro and V4.1 Flash, the same models its API serves.
- GPT-6.1 Sol: about 2,100 tokens. GPT-5.6 is counted with o200k_base, the tokenizer OpenAI publishes for it, so its count is exact. OpenAI has not published the tokenizer of GPT-6, so its count is the same o200k_base figure, marked as about.

## 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 Pro | GPT-6.1 Sol |
| --- | --- | --: | --: |
| A chat question | 300, 500, 100 | $7.13 | $16.80 |
| A hard question, with thinking | 300, 1,400, 100 | $17.82 | $43.80 |
| A long report, summarised | 60,000, 2,000, 20 | $52.27 | $84.00 |
| A 40-turn agent task | 2,800,000, 40,000, 10 | $192 | $364 |
| A support bot's reply | 4,000, 300, 2,000 | $235 | $432 |
| Sort a message into a category | 250, 5, 50,000 | $525 | $825 |
| Read an invoice into fields | 1,500, 250, 1,000 | $89.10 | $165 |
| Review a pull request | 25,000, 4,500, 50 | $76.23 | $143 |

## Questions

### Which is cheaper, DeepSeek V4 Pro or GPT-6.1 Sol?

DeepSeek V4 Pro is cheaper: $1.32 per million tokens read and $3.96 per million written, against $2 and $10 on GPT-6.1 Sol. On a mix of 3 tokens read for each 1 written, GPT-6.1 Sol costs 2 times as much.

### Which is better, DeepSeek V4 Pro or GPT-6.1 Sol?

On the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, GPT-6.1 Sol scores 166 and DeepSeek V4 Pro 155, above the top of the range of doubt around DeepSeek V4 Pro's score (GPT-5 is 150). One score is an average; test both on your own work before you switch.

### What does a support bot cost a month on DeepSeek V4 Pro and GPT-6.1 Sol?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, it costs $235 a month on DeepSeek V4 Pro and $432 on GPT-6.1 Sol: GPT-6.1 Sol costs 1.8 times as much for this job.

### What does an AI agent task cost on DeepSeek V4 Pro and GPT-6.1 Sol?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs 64 cents on DeepSeek V4 Pro and $1.21 on GPT-6.1 Sol. At 10 tasks a day that is $192 and $364 a month.

### Which has the larger context window, DeepSeek V4 Pro or GPT-6.1 Sol?

GPT-6.1 Sol, with 1.05M tokens against 1M on DeepSeek V4 Pro. The window holds your instructions, the files you attach, the conversation so far and the answer, all at once.

### Does the same text take the same number of tokens on DeepSeek V4 Pro and GPT-6.1 Sol?

No. Our lesson "How AI writes", 1,700 words long, is 2,063 tokens on DeepSeek V4 Pro and about 2,100 on GPT-6.1 Sol. Each maker cuts text its own way, and every extra token is paid for at the model's price.

### Can I pay less on DeepSeek V4 Pro and GPT-6.1 Sol for work that can wait?

On GPT-6.1 Sol only: with a batch, where you collect the answers later, it costs $1 per million tokens read and $5 written. DeepSeek's price page lists no batch price for DeepSeek V4 Pro.

## Sources

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

## Other comparisons

- [GPT-6.1 Sol vs GPT-6 Sol](https://tecyfy.com/prices/compare/gpt-6-1-sol-vs-gpt-6-sol.md)
- [GPT-5.6 Sol vs GPT-6.1 Sol](https://tecyfy.com/prices/compare/gpt-5-6-sol-vs-gpt-6-1-sol.md)
- [GPT-5.6 Terra vs GPT-6.1 Sol](https://tecyfy.com/prices/compare/gpt-5-6-terra-vs-gpt-6-1-sol.md)
- [GPT-5.6 Luna vs GPT-6.1 Sol](https://tecyfy.com/prices/compare/gpt-5-6-luna-vs-gpt-6-1-sol.md)
- [GPT-5.5 vs GPT-6.1 Sol](https://tecyfy.com/prices/compare/gpt-5-5-vs-gpt-6-1-sol.md)
- [GPT-5.5 pro vs GPT-6.1 Sol](https://tecyfy.com/prices/compare/gpt-5-5-pro-vs-gpt-6-1-sol.md)