# GPT-6 Astra vs Grok 4.7

Grok 4.7 is the cheaper of the 2: for the same tokens, 3 read for each 1 written, GPT-6 Astra costs 6.7 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/gpt-6-astra-vs-grok-4-7
- Makers: GPT-6 Astra from OpenAI, Grok 4.7 from xAI

## Price per million tokens, in US dollars

| | GPT-6 Astra | Grok 4.7 |
| --- | --: | --: |
| Input | $10 | $2 |
| Cached input | $1 | $0.50 |
| Cache write | $12.50 | not listed |
| Output | $50 | $6 |
| Blend, 3 read for each 1 written | $20 | $3 |
| Batch input | $5 | not listed |
| Batch output | $25 | not listed |
| Long prompt input (above 272K on GPT-6 Astra, 200K on Grok 4.7) | $20 | $4 |
| Long prompt output | $75 | $12 |
| Context window, tokens | 1.05M | 500K |
| Capability score (Epoch Capabilities Index; GPT-5 is 150) | 166 | 154 |
| Longest answer, tokens | 128K | 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:

- GPT-6 Astra: 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.
- 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.

## 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 | GPT-6 Astra | Grok 4.7 |
| --- | --- | --: | --: |
| A chat question | 300, 500, 100 | $84.00 | $10.80 |
| A hard question, with thinking | 300, 1,400, 100 | $219 | $27.00 |
| A long report, summarised | 60,000, 2,000, 20 | $420 | $79.20 |
| A 40-turn agent task | 2,800,000, 40,000, 10 | $2,196 | $618 |
| A support bot's reply | 4,000, 300, 2,000 | $2,220 | $408 |
| Sort a message into a category | 250, 5, 50,000 | $4,125 | $795 |
| Read an invoice into fields | 1,500, 250, 1,000 | $825 | $135 |
| Review a pull request | 25,000, 4,500, 50 | $713 | $116 |

## Questions

### Which is cheaper, GPT-6 Astra or Grok 4.7?

Grok 4.7 is cheaper: $2 per million tokens read and $6 per million written, against $10 and $50 on GPT-6 Astra. On a mix of 3 tokens read for each 1 written, GPT-6 Astra costs 6.7 times as much.

### Which is better, GPT-6 Astra or Grok 4.7?

On the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, GPT-6 Astra scores 166 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 GPT-6 Astra and Grok 4.7?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, it costs $2,220 a month on GPT-6 Astra and $408 on Grok 4.7: GPT-6 Astra costs 5.4 times as much for this job.

### What does an AI agent task cost on GPT-6 Astra and Grok 4.7?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs $7.32 on GPT-6 Astra and $2.06 on Grok 4.7. At 10 tasks a day that is $2,196 and $618 a month.

### Which has the larger context window, GPT-6 Astra or Grok 4.7?

GPT-6 Astra, 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 GPT-6 Astra and Grok 4.7?

No. Our lesson "How AI writes", 1,700 words long, is about 2,100 tokens on GPT-6 Astra and about 2,100 on Grok 4.7. Each maker cuts text its own way, and every extra token is paid for at the model's price.

### Can I pay less on GPT-6 Astra and Grok 4.7 for work that can wait?

On GPT-6 Astra only: with a batch, where you collect the answers later, it costs $5 per million tokens read and $25 written. xAI's price page lists no batch price for Grok 4.7.

## Sources

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

## Other comparisons

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