Head to head
Grok 4.3 vs Grok 4.5
Grok 4.3 (xAI) and Grok 4.5 (xAI) compared on intelligence, speed, context, and price — and which to choose. Both run on just4o.chat from one chat.
| Metric | Grok 4.3 | Grok 4.5 |
|---|---|---|
| Intelligence (AA index) | 38 | — |
| Output speed (tokens/sec) | 129.3 | — |
| Context window | 1M ✓ | 500K |
| Max output | 1M | — |
| Input price / 1M | $1.25 ✓ | $2 |
| Output price / 1M | $2.5 ✓ | $6 |
| Released | 2026-04 | 2026-07-08 |
Choose Grok 4.3 if you want…
- Lower price ($1.56 / 1M blended)
- Larger context window (1M)
Choose Grok 4.5 if you want…
- A comparable all-rounder — they trade blows on the headline metrics.
Grok 4.3
Grok 4.3 made a deliberate trade: xAI stopped chasing frontier performance and built something more practical instead. The result is a model that earns its keep through native X/Twitter integration — pulling posts seconds old when news breaks — and a 1 million token context window that handles entire codebases or lengthy regulatory documents in a single pass. At $1.25 per million input tokens, it arrives 40-60% cheaper than its predecessor Grok-4, and users find real value in its DeepSearch mode, which combines live web data with X discussions in a way that rivals Perplexity for current-events research. Frontend developers report genuinely polished web UI output, moving past the "cheap AI demo" look. The honest trade-off: creative writers consistently find it too literal and verbose, and its 16-second time-to-first-token sits at the high end for reasoning models in this price range. If your work is anchored in real-time information or long-document analysis rather than narrative craft, Grok 4.3 offers a focused, cost-sensible tool.
Full Grok 4.3 details →FAQ
Which is better, Grok 4.3 or Grok 4.5?
Grok 4.3 leads on 2 of the headline metrics (lower price ($1.56 / 1m blended); larger context window (1m)), while Grok 4.5 wins on other factors. The right pick depends on whether you prioritise capability, speed, or cost.
Is Grok 4.3 or Grok 4.5 cheaper?
Grok 4.3 is cheaper at $1.56 per 1M tokens (blended), versus $3.
Can I use both Grok 4.3 and Grok 4.5?
Yes. Both are available on just4o.chat from a single chat — you can switch between them per message with no separate subscriptions.