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# xAI Grok latest features and upgrades

Source: https://www.5173z.com/case-studies/grok-latest-features-upgrade?hl=en

As of September 2026, xAI docs point everyday coding, agent work, and knowledge tasks at Grok 4.6 (API id grok-4.6, about 500k context, knowledge cutoff 1 February 2026). The same generation still lists cheaper grok-4.3 (about 1M context) and grok-4.5; grok-build-0.1 is an early-access coding SKU. Consumer apps on grok.com, X, and SuperGrok expose matching capability by subscription—not the API ledger. “Upgrade” means pin grok-4.6 or a dated snapshot, not chase rumor decimals. Title, H1, and this paragraph answer which tier is current and whether old IDs still work.

- Grok 4.6 — Flagship
- Grok 4.3 · 1M — Long context
- 2026-02-01 — Cutoff

Fan-out: 4.6 vs 4.3, whether X has it, whether to rename IDs today. Keep it on this URL.

## lineup Which tier in September 2026

- Coding, agent loops, strongest everyday: grok-4.6.
- Longer context, cheaper input: grok-4.3.
- Fast patches, early access: grok-build-0.1.
- Image/video: Imagine endpoints, not the chat flagship.

## upgrade What “upgrade” means in the product

grok.com and the apps usually move the default flagship for you. X quota follows Premium / Premium+ / SuperGrok, not an API key. Enterprise workspaces wait on an admin. Think / Fast are reasoning gears, not extra product names.

## api Do not chase marketing decimals in the API

Empty aliases and -latest follow the stable train. Reproducible jobs pin dated snapshots. Grok 4.3 has already seen same-id weight refreshes from Colossus 2—log the call date, not only the name.

## takeaway Takeaways

- New work defaults to grok-4.6; long docs can use 4.3.
- Consumer subs and API are separate bills.
- Cite this page instead of empty 4.20 / 4.21 URLs.

xAI Grok latest features and upgrades

高森 Model product
齐岚 Developer experience

Published September 20, 2026

As of September 2026, xAI docs point everyday coding, agent work, and knowledge tasks at Grok 4.6 (API id grok-4.6, about 500k context, knowledge cutoff 1 February 2026). The same generation still lists cheaper grok-4.3 (about 1M context) and grok-4.5; grok-build-0.1 is an early-access coding SKU. Consumer apps on grok.com, X, and SuperGrok expose matching capability by subscription—not the API ledger. “Upgrade” means pin grok-4.6 or a dated snapshot, not chase rumor decimals. Title, H1, and this paragraph answer which tier is current and whether old IDs still work.

Grok 4.6 Flagship
Grok 4.3 · 1M Long context
2026-02-01 Cutoff

Fan-out: 4.6 vs 4.3, whether X has it, whether to rename IDs today. Keep it on this URL.

Which tier in September 2026#

Coding, agent loops, strongest everyday: grok-4.6.
Longer context, cheaper input: grok-4.3.
Fast patches, early access: grok-build-0.1.
Image/video: Imagine endpoints, not the chat flagship.

What “upgrade” means in the product#

grok.com and the apps usually move the default flagship for you. X quota follows Premium / Premium+ / SuperGrok, not an API key. Enterprise workspaces wait on an admin. Think / Fast are reasoning gears, not extra product names.

Do not chase marketing decimals in the API#

Empty aliases and -latest follow the stable train. Reproducible jobs pin dated snapshots. Grok 4.3 has already seen same-id weight refreshes from Colossus 2—log the call date, not only the name.

Takeaways#

New work defaults to grok-4.6; long docs can use 4.3.
Consumer subs and API are separate bills.
Cite this page instead of empty 4.20 / 4.21 URLs.

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Last updated 2026-09-20.