# Claude Haiku 5.5 vs DeepSeek V4.1 Flash

Claude Haiku 5.5 is the cheaper of the 2: for the same tokens, 3 read for each 1 written, DeepSeek V4.1 Flash costs 2.6 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/claude-haiku-5-5-vs-deepseek-flash
- Makers: Claude Haiku 5.5 from Anthropic, DeepSeek V4.1 Flash from DeepSeek

## Price per million tokens, in US dollars

| | Claude Haiku 5.5 | DeepSeek V4.1 Flash |
| --- | --: | --: |
| Input | $0.10 | $0.30 |
| Cached input | $0.01 | $0.006 |
| Cache write | $0.125 | not listed |
| Output | $0.50 | $1.20 |
| Blend, 3 read for each 1 written | $0.20 | $0.525 |
| Batch input | $0.05 | not listed |
| Batch output | $0.25 | not listed |
| Long prompt input (above 100K on Claude Haiku 5.5) | $0.50 | $0.30 |
| Long prompt output | $2.50 | $1.20 |
| Context window, tokens | 1M | 1M |
| Capability score (Epoch Capabilities Index; GPT-5 is 150) | 159 | 156 |
| Longest answer, tokens | 128K | 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.

## 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:

- Claude Haiku 5.5: about 2,100 to 3,600 tokens. Anthropic does not publish its tokenizer. It says Claude 4.7 and later produce about 30 percent more tokens for the same text than earlier models, and an independent test counted TypeScript at 1.73 times OpenAI's figure. The range runs from OpenAI's count to 1.75 times it.
- DeepSeek V4.1 Flash: 2,063 tokens. Counted with the tokenizer DeepSeek publishes with V4-Pro and V4.1 Flash, the same models its API serves.

## 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 | Claude Haiku 5.5 | DeepSeek V4.1 Flash |
| --- | --- | --: | --: |
| A chat question | 300, 500, 100 | 84 cents | $2.07 |
| A hard question, with thinking | 300, 1,400, 100 | $2.19 | $5.31 |
| A long report, summarised | 60,000, 2,000, 20 | $4.20 | $12.24 |
| A 40-turn agent task | 2,800,000, 40,000, 10 | $21.96 | $44.14 |
| A support bot's reply | 4,000, 300, 2,000 | $22.20 | $58.32 |
| Sort a message into a category | 250, 5, 50,000 | $41.25 | $122 |
| Read an invoice into fields | 1,500, 250, 1,000 | $8.25 | $22.50 |
| Review a pull request | 25,000, 4,500, 50 | $7.13 | $19.35 |

## Questions

### Which is cheaper, Claude Haiku 5.5 or DeepSeek V4.1 Flash?

Claude Haiku 5.5 is cheaper: $0.10 per million tokens read and $0.50 per million written, against $0.30 and $1.20 on DeepSeek V4.1 Flash. On a mix of 3 tokens read for each 1 written, DeepSeek V4.1 Flash costs 2.6 times as much.

### Which is better, Claude Haiku 5.5 or DeepSeek V4.1 Flash?

On the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, Claude Haiku 5.5 scores 159 and DeepSeek V4.1 Flash 156, above the top of the range of doubt around DeepSeek V4.1 Flash'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 Claude Haiku 5.5 and DeepSeek V4.1 Flash?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, it costs $22.20 a month on Claude Haiku 5.5 and $58.32 on DeepSeek V4.1 Flash: DeepSeek V4.1 Flash costs 2.6 times as much for this job.

### What does an AI agent task cost on Claude Haiku 5.5 and DeepSeek V4.1 Flash?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs 7.3 cents on Claude Haiku 5.5 and 15 cents on DeepSeek V4.1 Flash. At 10 tasks a day that is $21.96 and $44.14 a month.

### Which has the larger context window, Claude Haiku 5.5 or DeepSeek V4.1 Flash?

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 Claude Haiku 5.5 and DeepSeek V4.1 Flash?

No. Our lesson "How AI writes", 1,700 words long, is about 2,100 to 3,600 tokens on Claude Haiku 5.5 and 2,063 on DeepSeek V4.1 Flash. Each maker cuts text its own way, and every extra token is paid for at the model's price.

### Can I pay less on Claude Haiku 5.5 and DeepSeek V4.1 Flash for work that can wait?

On Claude Haiku 5.5 only: with a batch, where you collect the answers later, it costs $0.05 per million tokens read and $0.25 written. DeepSeek's price page lists no batch price for DeepSeek V4.1 Flash.

## Sources

- [Anthropic: API prices](https://platform.claude.com/docs/en/about-claude/pricing)
- [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

- [Claude Haiku 5.5 vs Claude Mythos 5.1](https://tecyfy.com/prices/compare/claude-haiku-5-5-vs-claude-mythos-5-1.md)
- [Claude Fable 5 vs Claude Haiku 5.5](https://tecyfy.com/prices/compare/claude-fable-5-vs-claude-haiku-5-5.md)
- [Claude Haiku 5.5 vs Claude Mythos 5](https://tecyfy.com/prices/compare/claude-haiku-5-5-vs-claude-mythos-5.md)
- [Claude Haiku 5.5 vs Claude Opus 5](https://tecyfy.com/prices/compare/claude-haiku-5-5-vs-claude-opus-5.md)
- [Claude Haiku 5.5 vs Claude Opus 4.8](https://tecyfy.com/prices/compare/claude-haiku-5-5-vs-claude-opus-4-8.md)
- [Claude Haiku 5.5 vs Claude Opus 4.7](https://tecyfy.com/prices/compare/claude-haiku-5-5-vs-claude-opus-4-7.md)