Grok 4
xAI's frontier reasoning model trained on the expanded Colossus cluster
Verdict
A real step up from Grok 3 on reasoning benchmarks, with native tool use and real-time knowledge via X integration. Massive compute budget keeps xAI competitive with the other frontier labs. Good alternative for teams wanting model diversity outside the OpenAI/Anthropic/Google trio.
Other Text Generation & Reasoning
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- GPT-5 miniProduction
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- GPT-4oProduction
OpenAI previous-gen multimodal model — text, vision, audio
- GPT-4o miniStable
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- GPT-OSS 120BStable
OpenAI's first open-weight model — 120B params, fully downloadable
- Claude Fable 5Production
Anthropic's most intelligent generally available model — Mythos-class reasoning