Grok
xAI · General AI · Research
xAI's assistant, available on X and standalone apps. Strong real-time awareness of the X firehose; supports custom instructions and file analysis on current versions.
Best for: Real-time X (Twitter) context and a direct, less filtered conversational register.
| Models | Grok model family |
|---|---|
| Free plan | Limited free access (varies) |
| Paid plans | Paid tiers via X Premium / SuperGrok subscriptions |
| API | Yes (xAI API) |
| Custom instructions | Yes, custom instructions in settings on current versions |
| Memory | Varies by version. Check settings |
| File upload | Yes |
| Web search | Yes, plus live X content |
| Context window | Large, model-dependent |
| Apps | Web · iOS · Android · inside X |
Facts last reviewed 2026-08-10, capabilities and plans change frequently; verify on the official site before relying on a detail.
Models, limits and pricing
| Current models | Grok 4.5, flagship, most intelligent and fastest xAI model Grok 4.3, prior-generation general model Grok 4.20, reasoning, non-reasoning and multi-agent variants Grok Build 0.1, build/agent model (SuperGrok Heavy gated) |
|---|---|
| Context window | 500k tokens (grok-4.5); 1M tokens (grok-4.3 and grok-4.20) |
| Parameters | Not disclosed most closed frontier models do not publish parameter counts; we do not repeat rumored figures. |
| Modalities | Text + image in; text out; image and video gen (Imagine); voice mode |
| Consumer pricing |
|
| API pricing | grok-4.5: $2.00 / 1M input, $6.00 / 1M output ($4 / $12 long-context) |
Pricing and model line-ups verified 2026-08-11 from source 1 ↗ · source 2 ↗ · source 3 ↗. These change often. The vendor page is authoritative.
Notable
- Live X/Twitter grounding
- DeepSearch-style research modes