Grok 4 Fast
Open in the interactive archive →
Download the covers: Floppy card · VHS cover · Vinyl cover
A to Z
- A · App
- Yes
- B · Built By
- xAI
- C · CEO & Politics
- Elon Musk — Right / Republican; largest individual donor of 2024 cycle; revived America PAC with $100M+ for GOP in 2026 midterms (America Party plan shelved)
- D · Date
- 2025
- E · Expertise
- Beginner (app available)
- F · Free Tier
- Yes
- G · Generates
- Text only
- H · Deployment
- Cloud only (proprietary)
- I · Inputs
- Text+Image+Audio
- J · Jurisdiction
- USA
- K · Key Staffers
- Part of SpaceX (Elon Musk, CEO); Gwynne Shotwell (SpaceX President)
- L · Languages
- English-primary
- M · Model Type
- Multimodal LLM
- N · Safety Issues
- None reported
- O · Open Source
- Proprietary
- P · Pricing
- Retired (xAI API retired Grok 4 Fast on May 15, 2026; requests now go to Grok 4.3)
- Q · AIDb Rating
- 6/10 · AIDb v2.0 (curated): Capability 6.5/10 · Currency 5/10 · Access 7/10 · Significance 6/10 → 6.20
- R · What Makes It Special
- Grok 4 Fast (September 19, 2025), xAI's cost-efficient reasoning model built on lessons from Grok 4: one unified model for reasoning and non-reasoning modes with a 2M-token context, trained end to end with tool-use RL for agentic web and X search. xAI said it matched Grok 4 on benchmarks with 40% fewer thinking tokens, cutting the price of equal performance by 98%, scored 92.0% on AIME 2025 and took #1 in LMArena's Search Arena. Its API was retired May 15, 2026, with requests sent to Grok 4.3.
- S · Stock / Status
- Public via SpaceX (Nasdaq: SPCX, IPO Jun 12, 2026); $145 (SPCX, Sep 28, 2026)
- T · Training Cutoff
- [UNKNOWN]
- U · Users
- [UNKNOWN]
- V · Voice Chat
- Yes
- W · Weights
- API only
- X · X Handle
- @SpaceXSI
- Y · Year Founded
- [UNKNOWN]
- Z · Bottom Line
- Proprietary Multimodal LLM from xAI, released 2025.
Data completeness 88% · Last verified 2026-08-09 · Primary source ↗
Cite this
“Grok 4 Fast.” AIDb — The AI Database. Verified 2026-08-09. https://theaidatabase.com/m/xai-grok-4-fast.html
More from xAI
Aurora (xAI) · Grok (X Premium+) · Grok 1 · Grok 2 · Grok 3 · Grok 4 · Grok 4.1 · Grok 4.1 Fast