Compare AI models
| Specifications | ||
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 200k | 2M |
| Overview | ||
| Company | Anthropic | SpaceXSI |
| Release date | Nov 21 2023 | Sep 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude 2.1vsGPT-6.1 SolGrok 4 FastvsGPT-6.1 SolClaude 2.1vsGemini 4 ArgonGrok 4 FastvsGemini 4 ArgonClaude 2.1vsMuse Spark OpenGrok 4 FastvsMuse Spark OpenClaude 2.1vsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017Claude 2.1vsMistral Large 4Grok 4 FastvsMistral Large 4Claude 2.1vsKimi K3Grok 4 FastvsKimi K3Frequently asked questions
Claude 2.1 and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 2.1 shipped 668 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude 2.1) vs 2M (Grok 4 Fast).
Direct benchmark comparisons are unavailable — Claude 2.1 and Grok 4 Fast don't publish scores on any of the same benchmarks.