Grok-4.20 Reasoning vs Grok 4.3 — Price, Context, and Capability Compared
Verdict
Grok-4.20 Reasoning costs 1.9× more per blended million tokens than Grok 4.3. Grok-4.20 Reasoning has the larger context window (1,000,000 tokens). Default to Grok 4.3 unless you specifically need Grok-4.20 Reasoning's edge.
Spec comparison
| Grok-4.20 Reasoning | Grok 4.3 | |
|---|---|---|
| Price (input) | $2.00/M | $1.25/M ✓ |
| Price (output) | $6.00/M | $2.50/M ✓ |
| Blended price | $3.00/M | $1.56/M ✓ |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Max output | 64,000 tokens | 64,000 tokens |
| Modalities | text, vision | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-03 | 2026-06 |
| Speed | 52 t/s | 98 t/s ✓ |
Cost at scale (3:1 blended)
| Tokens / month | Grok-4.20 Reasoning | Grok 4.3 | Delta |
|---|---|---|---|
| 1,000,000 | $3.00 | $1.56 | $1.44 (1.9×) |
| 10,000,000 | $30.00 | $15.63 | $14.38 (1.9×) |
| 100,000,000 | $300.00 | $156.25 | $143.75 (1.9×) |
Choose Grok-4.20 Reasoning if…
- ✓State-of-the-art document analysis at 1M context
- ✓Dedicated reasoning mode
- ✓Strong vision understanding
- ✓Long-document analysis and problems that benefit from explicit reasoning.
Choose Grok 4.3 if…
- ✓xAI’s general-purpose flagship
- ✓Extremely fast for its size
- ✓1M-token context
- ✓General-purpose work where speed and a huge context window both matter.
Run this exact matchup right now
Send the same prompt to Grok-4.20 Reasoning and Grok 4.3 side by side and see the outputs yourself.
Try Grok-4.20 Reasoning vs Grok 4.3 FreeFAQ
Is Grok-4.20 Reasoning cheaper than Grok 4.3?
Grok 4.3 is cheaper, at $1.56 per million blended tokens vs $3.00 for Grok-4.20 Reasoning.
Which has the bigger context window, Grok-4.20 Reasoning or Grok 4.3?
Both models support 1,000,000 tokens of context.
Can Grok-4.20 Reasoning replace Grok 4.3 for coding?
Both are viable for coding. State-of-the-art document analysis at 1M context (Grok-4.20 Reasoning) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.
Which is faster, Grok-4.20 Reasoning or Grok 4.3?
Grok 4.3 is faster: 98 t/s vs 52 t/s, measured on our speed benchmarks.
Related
Pricing verified 2026-04-06. Specs verified 2026-08-08.
