Grok 4 / prior is a Prior flagship from xAI (United States).
One-line fit: best used for Chat + reasoning.
Key specifications
| Provider | xAI |
|---|---|
| Model | Grok 4 / prior |
| Type | Prior flagship |
| Context window | Large |
| Pricing (indicative) | API tiers |
| Company category | Frontier Lab |
| Region | United States |
| Official site | https://x.ai |
Benchmarks and public standing
Strong LMSYS-era showings
Treat scores as directional. SWE-bench, Terminal-Bench, LMSYS Arena, Artificial Analysis, and vendor cards use different harnesses and are not always comparable 1:1. Re-check the latest official model card before decisions.
What this model is good at
Chat + reasoning
This aligns with xAI’s broader strengths:
- Intelligence per dollar
- Coding agents (Cursor flywheel)
- Realtime news/culture via X
- High TPS inference
Limitations and watch-outs
Superseded by 4.5
- Rate limits, regional availability, and data retention policies vary by plan.
- Agent harness quality (Cursor, Claude Code, Codex, custom tools) can change outcomes more than raw model Elo.
- Open-weight availability (if any) is separate from hosted API quality and safety filters.
Ideal users
- Product engineers shipping features that match: Chat + reasoning
- Teams standardizing on the xAI ecosystem
- Agent builders who need a Prior flagship
When to pick something else
- Cheaper volume: compare lower tiers from the same lab or open Chinese/EU alternatives.
- Maximum hard SWE thoughtfulness: compare Claude Fable-class and other coding flagships.
- Giant multimodal corpora / Workspace: compare Gemini-class models.
- Self-host / open weights: Llama, Qwen, DeepSeek, GLM, Mistral open lines.
Parent company
xAI – Grok models emphasize real-time X data, coding agents, price/efficiency, and a distinct less-lecturing personality.
Related models from xAI
- Grok 4.5 – Flagship coding/agent
- Grok Imagine / media – Image/video gen
Data is curated for AIForumSphere model directory mid-2026 directional figures.
