Grok 4.3
Flagship multimodal LLM for agentic tool calling, long context, and low-hallucination reasoning
Grok 4.3
Flagship multimodal LLM for agentic tool calling, long context, and low-hallucination reasoning
Grok 4.3 Overview
Grok 4.3 is xAI's flagship language model for agentic reasoning, strong instruction following, and minimal hallucinations. It supports text and image input, a 1 million token context window, configurable reasoning effort including non-reasoning mode, function calling, and structured outputs for production assistants, coding workflows, and long-context analysis.
How to Use Grok 4.3
Overview
Grok 4.3 is xAI's flagship multimodal language model built for long-context reasoning, strong tool use, and low-hallucination instruction following.
It is a strong fit for applications that need a high-capability general-purpose model with image understanding, configurable reasoning depth, and reliable behavior in agentic workflows.
Strengths
Strong Agentic Tool Calling
Grok 4.3 is positioned around strong tool calling and agentic execution. It is built for workflows where the model must not only answer, but also coordinate actions, query systems, and operate inside multi-step application logic.
Low-Hallucination Behavior
xAI positions Grok 4.3 as a flagship model with a very low hallucination rate. This makes it a strong fit for professional workflows where factual reliability and instruction accuracy matter more than pure generative style.
Configurable Reasoning
The model supports configurable reasoning effort, including none, low, medium, and high. That gives it useful range across latency-sensitive requests and deeper reasoning-heavy tasks.
Very Large Context Window
Grok 4.3 supports a 1 million token context window. It is useful for long documents, large retrieval payloads, multi-file coding work, and analysis pipelines where a substantial working set must remain in scope.
Multimodal Understanding
The model supports both text and image input. It is useful for visual question answering, screenshot analysis, document understanding, and text-plus-image workflows where visual context needs to be incorporated into the response.
Structured Production Workflows
Grok 4.3 supports structured outputs and function calling, which makes it suitable for applications that need predictable orchestration, schema-constrained responses, and production-grade integration patterns.
Capabilities
Text-to-Text
Grok 4.3 handles general text generation, reasoning, summarization, planning, coding assistance, and structured response workflows.
Image-to-Text
The model can take image input and use visual context as part of a larger text-based reasoning task.
Function Calling
Grok 4.3 supports function calling and structured outputs, making it well suited to tool-using assistants and agent-style systems.
Input and Output
- AIR ID:
xai:[email protected] - Input: text and image input
- Output: text
- Context window: 1,000,000 tokens
- Reasoning effort:
none,low,medium,high - Structured outputs: supported
- Function calling: supported
Best Fit
- Tool-using assistants
- Coding and debugging workflows
- Long-context analysis
- Image-grounded reasoning
- Production systems that need structured outputs
More models from xAI
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