Grok 4.20 (Reasoning)
Model ID
- Context
- 1M
- 30K max output
- Input price
- $1.25
- per 1M tokens · xAI API
- Output price
- $2.50
- per 1M tokens
- Epoch Capabilities Index
- —
- Not listed
- LMArena Text
- —
- Not listed
Where to run it
1 offering · prices as listed| Meter | Tier | Price |
|---|---|---|
| Input | Standard | $1.25 / 1M tokens |
| Prompts over 200K tokens | $2.50 / 1M tokens | |
| Output | Standard | $2.50 / 1M tokens |
| Prompts over 200K tokens | $5.00 / 1M tokens | |
| Cache read | Standard | $0.20 / 1M tokens |
| Prompts over 200K tokens | $0.40 / 1M tokens | |
Cited scores
From third-party leaderboards, not measured by us- Epoch AI · FrontierMath Tiers 1–3 44.9%
#41 of 56 listed models · ±2.95
Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Sep 26, 2026 · changes we made
- Epoch AI · GPQA Diamond 89.3%
#32 of 64 listed models · ±1.86
Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Sep 26, 2026 · changes we made