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Grok 4.20: price, performance and context
Proprietary Grok 4.20 by xAI costs $1.25 per 1M input and $2.50 per 1M output tokens, handles up to 2M tokens in one request (≈ 6,000 pages of text) and scores 25.7 points on the AgentKernel performance index, rank 64 of 212.
Privacy: zero data retention with one provider, not in the EU. Availability over the last 24 h: 100%.
Updated Oct 09, 2026, 17:39 UTC · x-ai/grok-4.20
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Key facts
- Licence
- Proprietary: no public weights, only through a provider API
- Input / 1M tokens
- $1.25
- Output / 1M tokens
- $2.50
- Context window
- 2M tokens
- Max. output
- 1.8M tokens
- Performance index
- 25.7 points · rank 64 of 212
- Coding index
- n/a
- Agentic index
- n/a
- Cost at your usage
- $1.875 / month
- Knowledge cutoff
- Sep 2025
- In the catalog since
- Mar 31, 2026
- Capabilities
- Reasoning, Vision, Tool Calling, Files
What do you get for $10.00?
Rules of thumb from the cost calculator, base rates without caching or taxes.
| Task | Cost per task | For $10.00 |
|---|
| Chat repliesA question with a short history, a detailed answer | $0.002 | 6,200 |
| Email draftsBullet points in, a finished email out | $0.001 | 7,600 |
| Document summariesRead 10 pages, write a one-page summary | $0.005 | 1,900 |
| Code reviewsReview and comment on 500 lines of code | $0.009 | 1,100 |
| Book analysesAnalyse a 300-page book in one go | $0.13 | 76 |
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