xAI · Grok (xAI)
Grok 4.20
ActiveExtended-reasoning model with Think Mode; strongest hallucination resistance in the Grok family ($2.00/$6.00 per 1M).
About this version
Grok 4.20 is an active, reasoning‑tier model in the Grok family released on 1 February 2026. It features a very large context window of one million tokens and introduces an extended‑reasoning “Think Mode” aimed at reducing hallucinations, which are reported as the lowest within the Grok series.
- API string
- grok-4.20
- Context window
- 1M ctx
- Tier
- Reasoning
- Released
- Feb 1, 2026
Release & change timeline
1 event- Release
Grok 4.20 released
Extended-reasoning model with Think Mode; $2.00/$6.00, 1M context. Guide gives month only (~Feb 2026).
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