GPT-6 Astra vs Grok 4.6
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| GPT-6 Astra | Grok 4.6 | |
|---|---|---|
| API model IDs | gpt-6-astra | grok-4.6 |
| Context window | 1,050,000 | 500,000 |
| Lifecycle | active | active |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | on-request | yes |
| Input per 1M tokens | $10 (verified 2026-09-08) | $2 (verified 2026-09-08) |
Frequently asked questions
- Which has the larger context window, GPT-6 Astra or Grok 4.6?
- GPT-6 Astra holds 1,050,000 tokens and Grok 4.6 holds 500,000. GPT-6 Astra holds more. The context window counts the prompt, any attached files, and the reply together.
- Which is cheaper, GPT-6 Astra or Grok 4.6?
- Per million input tokens, GPT-6 Astra was $10 (verified 2026-09-08) and Grok 4.6 was $2 (verified 2026-09-08). Grok 4.6 is cheaper per input token. Output tokens cost $50 and $6 respectively, and output volume usually decides the bill.
- Does GPT-6 Astra or Grok 4.6 train on API data?
- GPT-6 Astra does not train on API data by default, and Grok 4.6 does not train on API data by default. Zero data retention is on-request for GPT-6 Astra and yes for Grok 4.6. Verified 2026-09-08 and 2026-09-08 against the providers' own documentation.
- Is GPT-6 Astra or Grok 4.6 being retired?
- GPT-6 Astra is active. Grok 4.6 is active. Lifecycle checked 2026-09-08 and 2026-09-08. Pin a dated snapshot ID rather than an alias if a retirement would break you.