Plain-English Summary
xAI’s flagship reasoning model for coding, research, current-information workflows, and tool-using agents.
Grok 4.5
xAI’s flagship reasoning model for coding, research, current-information workflows, and tool-using agents.
Grok 4
Reasoning LLM
GA
Open weights: No
API: Yes
Technical Notes
Proprietary reasoning model with configurable effort, approximately 1M context, web/X search, code execution, and function calling.
Best For
Current-event research, coding, agents, analysis using web and X data
Watch Out For
Closed weights; quality can depend on search/tool configuration.
Model Specs
- Maker
- xAI / SpaceXAI
- Country
- USA
- Family
- Grok 4
- Type
- Reasoning LLM
- Release date
- 2026-07-08
- Date confidence
- Exact
- Status
- GA
- Context window
- 1,000,000 tokens
- Max output
- Not listed
- Parameters
- Not disclosed
- Active parameters
- Not disclosed
- Architecture
- Proprietary multimodal transformer
- Reasoning
- Yes — low/medium/high
- Tool calling
- Yes — function, web, X, code
- Structured output
- Yes
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- License
- Proprietary
- Inputs
- Text, image
- Outputs
- Text
- Approx. price
- $2 input / $6 output per 1M tokens
- How to access
- Provider website or API
- Model / API ID
- grok-4.5
- Knowledge cutoff
- 2026-02-01
- Fine-tuning
- Prompting / RAG
- Completeness
- 86 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source