# Kimi K3 vs Kimi K3.1 Pro

Kimi K3.1 Pro is one of Moonshot AI's newest models and Kimi K3 an earlier one, so this is also what moving up costs or saves. Kimi K3.1 Pro is the cheaper of the 2: for the same tokens, 3 read for each 1 written, Kimi K3 costs 1.5 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/kimi-k3-vs-kimi-k3-1-pro
- Makers: Kimi K3 from Moonshot AI, Kimi K3.1 Pro from Moonshot AI

## Price per million tokens, in US dollars

| | Kimi K3 | Kimi K3.1 Pro |
| --- | --: | --: |
| Input | $3 | $2 |
| Cached input | $0.30 | $0.20 |
| Cache write | $3 | $2 |
| Output | $15 | $10 |
| Blend, 3 read for each 1 written | $6 | $4 |
| Batch input | not listed | not listed |
| Batch output | not listed | not listed |
| Context window, tokens | 1.05M | 1.05M |
| Capability score (Epoch Capabilities Index; GPT-5 is 150) | 157 | not listed |
| Longest answer, tokens | not listed | not listed |

## 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 | Kimi K3 | Kimi K3.1 Pro |
| --- | --- | --: | --: |
| A chat question | 300, 500, 100 | $25.20 | $16.80 |
| A hard question, with thinking | 300, 1,400, 100 | $65.70 | $43.80 |
| A long report, summarised | 60,000, 2,000, 20 | $126 | $84.00 |
| A 40-turn agent task | 2,800,000, 40,000, 10 | $659 | $439 |
| A support bot's reply | 4,000, 300, 2,000 | $666 | $444 |
| Sort a message into a category | 250, 5, 50,000 | $1,238 | $825 |
| Read an invoice into fields | 1,500, 250, 1,000 | $248 | $165 |
| Review a pull request | 25,000, 4,500, 50 | $214 | $143 |

## Questions

### Which is cheaper, Kimi K3 or Kimi K3.1 Pro?

Kimi K3.1 Pro is cheaper: $2 per million tokens read and $10 per million written, against $3 and $15 on Kimi K3. On a mix of 3 tokens read for each 1 written, Kimi K3 costs 1.5 times as much.

### Which is better, Kimi K3 or Kimi K3.1 Pro?

Kimi K3 scores 157 on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks (GPT-5 is 150). Kimi K3.1 Pro has no independent score yet, so the only fair test is to run the same 10 tasks on both.

### What does a support bot cost a month on Kimi K3 and Kimi K3.1 Pro?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, it costs $666 a month on Kimi K3 and $444 on Kimi K3.1 Pro: Kimi K3 costs 1.5 times as much for this job.

### What does an AI agent task cost on Kimi K3 and Kimi K3.1 Pro?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs $2.20 on Kimi K3 and $1.46 on Kimi K3.1 Pro. At 10 tasks a day that is $659 and $439 a month.

### Which has the larger context window, Kimi K3 or Kimi K3.1 Pro?

Neither: both hold 1.05M tokens at once, about 1,572.9 pages of English text.

### Does the same text take the same number of tokens on Kimi K3 and Kimi K3.1 Pro?

Yes, both are counted the same way: our lesson "How AI writes", 1,700 words long, is 2,055 tokens on each.

### Is it cheaper to move from Kimi K3 to Kimi K3.1 Pro?

Yes, per token: Kimi K3.1 Pro costs $2 per million tokens read and $10 written, against $3 and $15 on Kimi K3, which costs 1.5 times as much for the same tokens. Run your own tasks on it before you switch, since answers, length and thinking can differ.

### Can I pay less on Kimi K3 and Kimi K3.1 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

- [Moonshot AI: API prices](https://platform.kimi.ai/docs/pricing/chat)
- [Epoch Capabilities Index, by Epoch AI (CC BY 4.0)](https://epoch.ai/benchmarks/eci)

## Other comparisons

- [Kimi K3.1 Pro vs Kimi K3.1 Pro Highspeed](https://tecyfy.com/prices/compare/kimi-k3-1-pro-vs-kimi-k3-1-pro-highspeed.md)
- [Kimi K2.7 Code vs Kimi K3.1 Pro](https://tecyfy.com/prices/compare/kimi-k2-7-code-vs-kimi-k3-1-pro.md)
- [Kimi K2.7 Code Highspeed vs Kimi K3.1 Pro](https://tecyfy.com/prices/compare/kimi-k2-7-code-highspeed-vs-kimi-k3-1-pro.md)
- [Kimi K2.6 vs Kimi K3.1 Pro](https://tecyfy.com/prices/compare/kimi-k2-6-vs-kimi-k3-1-pro.md)
- [GPT-6 Astra vs Kimi K3.1 Pro](https://tecyfy.com/prices/compare/gpt-6-astra-vs-kimi-k3-1-pro.md)
- [GPT-6.1 Sol vs Kimi K3.1 Pro](https://tecyfy.com/prices/compare/gpt-6-1-sol-vs-kimi-k3-1-pro.md)