# Grok 4.7 vs Kimi K3

Grok 4.7 is the cheaper of the 2: for the same tokens, 3 read for each 1 written, Kimi K3 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/grok-4-7-vs-kimi-k3
- Makers: Grok 4.7 from xAI, Kimi K3 from Moonshot AI

## Price per million tokens, in US dollars

| | Grok 4.7 | Kimi K3 |
| --- | --: | --: |
| Input | $2 | $3 |
| Cached input | $0.50 | $0.30 |
| Cache write | not listed | $3 |
| Output | $6 | $15 |
| Blend, 3 read for each 1 written | $3 | $6 |
| Batch input | not listed | not listed |
| Batch output | not listed | not listed |
| Long prompt input (above 200K on Grok 4.7) | $4 | $3 |
| Long prompt output | $12 | $15 |
| Context window, tokens | 500K | 1.05M |
| Capability score (Epoch Capabilities Index; GPT-5 is 150) | 154 | 157 |
| Longest answer, tokens | not listed | not listed |

## 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:

- Grok 4.7: about 2,100 tokens. xAI publishes neither its tokenizer nor a rule for estimating. The figure is OpenAI's o200k_base count, a rough guide only.
- Kimi K3: 2,055 tokens. Counted with the tokenizer Moonshot AI publishes with Kimi K3, the model 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 | Grok 4.7 | Kimi K3 |
| --- | --- | --: | --: |
| A chat question | 300, 500, 100 | $10.80 | $25.20 |
| A hard question, with thinking | 300, 1,400, 100 | $27.00 | $65.70 |
| A long report, summarised | 60,000, 2,000, 20 | $79.20 | $126 |
| A 40-turn agent task | 2,800,000, 40,000, 10 | $618 | $659 |
| A support bot's reply | 4,000, 300, 2,000 | $408 | $666 |
| Sort a message into a category | 250, 5, 50,000 | $795 | $1,238 |
| Read an invoice into fields | 1,500, 250, 1,000 | $135 | $248 |
| Review a pull request | 25,000, 4,500, 50 | $116 | $214 |

## Questions

### Which is cheaper, Grok 4.7 or Kimi K3?

Grok 4.7 is cheaper: $2 per million tokens read and $6 per million written, against $3 and $15 on Kimi K3. On a mix of 3 tokens read for each 1 written, Kimi K3 costs 2 times as much.

### Which is better, Grok 4.7 or Kimi K3?

On the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, Kimi K3 scores 157 and Grok 4.7 154, above the top of the range of doubt around Grok 4.7'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 Grok 4.7 and Kimi K3?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, it costs $408 a month on Grok 4.7 and $666 on Kimi K3: Kimi K3 costs 1.6 times as much for this job.

### What does an AI agent task cost on Grok 4.7 and Kimi K3?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs $2.06 on Grok 4.7 and $2.20 on Kimi K3. At 10 tasks a day that is $618 and $659 a month.

### Which has the larger context window, Grok 4.7 or Kimi K3?

Kimi K3, with 1.05M tokens against 500K on Grok 4.7. 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 Grok 4.7 and Kimi K3?

No. Our lesson "How AI writes", 1,700 words long, is about 2,100 tokens on Grok 4.7 and 2,055 on Kimi K3. Each maker cuts text its own way, and every extra token is paid for at the model's price.

### Can I pay less on Grok 4.7 and Kimi K3 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

- [xAI: API prices](https://docs.x.ai/docs/models)
- [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

- [Grok 4.6 vs Grok 4.7](https://tecyfy.com/prices/compare/grok-4-6-vs-grok-4-7.md)
- [Grok 4.5 vs Grok 4.7](https://tecyfy.com/prices/compare/grok-4-5-vs-grok-4-7.md)
- [Grok 4.3 vs Grok 4.7](https://tecyfy.com/prices/compare/grok-4-3-vs-grok-4-7.md)
- [Grok 4.20 (reasoning) vs Grok 4.7](https://tecyfy.com/prices/compare/grok-4-20-0309-reasoning-vs-grok-4-7.md)
- [Grok 4.20 (non-reasoning) vs Grok 4.7](https://tecyfy.com/prices/compare/grok-4-20-0309-non-reasoning-vs-grok-4-7.md)
- [Grok 4.7 vs Grok Build 0.1](https://tecyfy.com/prices/compare/grok-4-7-vs-grok-build-0-1.md)