Grok 4.6 vs Grok 4.5
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Grok 4.6 | Grok 4.5 | |
|---|---|---|
| API model IDs | grok-4.6 | grok-4.5, grok-4.5-latest, grok-4.5-build-latest |
| Context window | 500,000 | 500,000 |
| Lifecycle | active | active |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | yes | yes |
| Input per 1M tokens | $2 (verified 2026-09-08) | $2 (verified 2026-09-08) |
Frequently asked questions
- Which has the larger context window, Grok 4.6 or Grok 4.5?
- Grok 4.6 holds 500,000 tokens and Grok 4.5 holds 500,000. Both hold 500,000 tokens. The context window counts the prompt, any attached files, and the reply together.
- Which is cheaper, Grok 4.6 or Grok 4.5?
- Per million input tokens, Grok 4.6 was $2 (verified 2026-09-08) and Grok 4.5 was $2 (verified 2026-09-08). Input pricing is the same on both. Output tokens cost $6 and $6 respectively, and output volume usually decides the bill.
- Does Grok 4.6 or Grok 4.5 train on API data?
- Grok 4.6 does not train on API data by default, and Grok 4.5 does not train on API data by default. Zero data retention is yes for Grok 4.6 and yes for Grok 4.5. Verified 2026-09-08 and 2026-09-08 against the providers' own documentation.
- Is Grok 4.6 or Grok 4.5 being retired?
- Grok 4.6 is active. Grok 4.5 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.