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 |
| These models have no shared benchmark scores. | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 34% | — |
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 72.5% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 79.6% | — |
| Overview | ||
| Company | Anthropic | SpaceXSI |
| Release date | May 22 2025 | Sep 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude Opus 4vsGPT-6.1 SolGrok 4 FastvsGPT-6.1 SolClaude Opus 4vsGemini 4 ArgonGrok 4 FastvsGemini 4 ArgonClaude Opus 4vsMuse Spark OpenGrok 4 FastvsMuse Spark OpenClaude Opus 4vsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017Claude Opus 4vsMistral Large 4Grok 4 FastvsMistral Large 4Claude Opus 4vsKimi K3Grok 4 FastvsKimi K3Frequently asked questions
Claude Opus 4 and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Opus 4 shipped 120 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude Opus 4) vs 2M (Grok 4 Fast).
Direct benchmark comparisons are unavailable — Claude Opus 4 and Grok 4 Fast don't publish scores on any of the same benchmarks.