Grok 4.20
legacyxAI · Released Mar 2026
Predecessor to Grok 4.3 with 2M context. Later aligned to Grok 4.3 pricing.
- Strengths
- Huge 2M-token context, later aligned to Grok 4.3 pricing.
- Best for
- Very long-context tasks that exceed a 1M window.
- Limitations
- Superseded by Grok 4.3.
Input / 1M
$1.25
Output / 1M
$2.50
Cached input / 1M
$0.2
Context window
2M
Price history
Input (solid)Output (dashed)
Price change
- 30d
- in — out —
- 90d
- in decreased 37.5% out decreased 58.3%
- 1y
- in decreased 37.5% out decreased 58.3%
- Since launch
- in decreased 37.5% out decreased 58.3%
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 12 May 2026 | $1.25 | $2.50 | $0.2 | Realigned to Grok 4.3 pricing; present by Wayback docs.x.ai capture 2026-05-12 (realignment bracketed 2026-04-01 → 2026-05-12) | docs.x.ai |
| 10 Mar 2026 | $2.00 | $6.00 | $0.2 | Launch pricing (OpenRouter; still $2/$6 at Wayback capture 2026-04-01) | openrouter.ai/x-ai/grok-4.20 |