As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/grok-4-3/

# Grok 4.3

xAI, Grok 4 family. Status: current. Type: reasoning model. Released: 2026-04. Training cutoff: not published.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| xAI API | `grok-4.3` | https://api.x.ai/v1/chat/completions | https://docs.x.ai/docs/models/grok-4.3 |
| AWS Bedrock | `xai.grok-4.3` |  | https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-xai-grok-4-3.html |
| OpenRouter | `x-ai/grok-4.3` |  | https://openrouter.ai/x-ai/grok-4.3 |
| Web app |  |  | https://grok.com |

## Pricing

- Input: $1.25 per 1M tokens
- Cached input: $0.20 per 1M tokens
- Output: $2.50 per 1M tokens
- Input, prompts over 200K tokens: $2.50 per 1M tokens
- Output, prompts over 200K tokens: $5 per 1M tokens
- Unit as published: per 1M tokens (USD); Batch API 20% off
- Source: https://docs.x.ai/docs/models
- Last checked: 2026-09-29

## Specs

- Input: text, image
- Output: text
- Context window: 1,000,000 tokens
- Max output: not published
- Open weights: no
- Licence: proprietary

## What it has not seen

- No published training cutoff. Counted from its release (2026-04): at least 1,863 AI events since (426 major, 83 historic), as of 2026-11-13.
- Everything since March 2026: https://postcutoff.com/since/2026-03/

## What stands out

- 1M context at budget price: 1M-token context window at $1.25/$2.50, cheaper than the 500K-context Grok 4.5-4.7 line. Source: https://docs.x.ai/docs/models/grok-4.3
- Reasoning effort incl. none: Reasoning effort none / low / medium / high / xhigh, default low - usable as a fast non-reasoning model. Source: https://docs.x.ai/docs/models/grok-4.3

## Notes

Alias grok-4.3-latest. Cheaper long-context option still offered alongside Grok 4.7. Release month inferred from OpenRouter listing date (2026-04-30); exact date not verified.

Cost-efficient 1M-context Grok for long documents and high-volume agents.

```bash
curl https://api.x.ai/v1/chat/completions -H "Authorization: Bearer $XAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"grok-4.3","messages":[{"role":"user","content":"Hello"}]}'
```

Sources: https://docs.x.ai/docs/models , https://docs.x.ai/docs/models/grok-4.3

Model page: https://postcutoff.com/m/grok-4-3/