Plain-English Summary
A high-capability Grok model with long context and configurable reasoning for production applications.
Grok 4.3
A high-capability Grok model with long context and configurable reasoning for production applications.
Grok 4
Reasoning LLM
GA
Open weights: No
API: Yes
Technical Notes
Text-and-image input model with 1M context, structured outputs, function calling, and adjustable reasoning effort.
Best For
Long-document analysis, assistants, coding, research
Watch Out For
Superseded by Grok 4.5 for the highest capability.
Model Specs
- Maker
- xAI / SpaceXAI
- Country
- USA
- Family
- Grok 4
- Type
- Reasoning LLM
- Release date
- Not listed
- Date confidence
- Not publicly stated
- 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 — none/low/medium/high
- Tool calling
- Yes
- Structured output
- Yes
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- License
- Proprietary
- Inputs
- Text, image
- Outputs
- Text
- Approx. price
- $1.25 input / $2.50 output per 1M tokens
- How to access
- Provider website or API
- Model / API ID
- grok-4.3
- Knowledge cutoff
- Not publicly disclosed
- Fine-tuning
- Prompting / RAG
- Completeness
- 81 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source