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xAI Intermediate

Grok 4.3

Grok 4.3 is xAI’s fast general model with a 1M context, image input, configurable reasoning and tool calling, priced at $1.25/M input and $2.50/M output.

Multimodal ModelsTextImage Paid
In plain English

What is this model and why does it matter?

Grok 4.3 is xAI's fast general model with a 1M context window, text and image input, configurable reasoning, tool calling and structured outputs.

AgentsTool useLong-context analysisCodingMultimodal assistants
Model overview

Grok 4.3: features, use cases and important details

Grok 4.3 is a current AI model verified from first-party xAI sources.

Grok 4.3 verified specifications

Grok 4.3 is xAI’s fast general model with a 1M context window, text and image input, configurable reasoning, tool calling and structured outputs. Its verified context or usage limit is 1000000 tokens, with Model/API dependent; not listed as a single public limit on the model page maximum output.

Grok 4.3 pricing and access

Grok 4.3 costs $1.25 per 1M input tokens, $0.20 per 1M cached input tokens and $2.50 per 1M output tokens.

Grok 4.3 best uses

Agents, Tool use, Long-context analysis, Coding, Multimodal assistants.

Grok 4.3 limitations

Production agents require tool safeguards, Very long prompts can increase cost, Outputs need domain validation.

Get started

How to use this model

  1. Create an xAI API key.
  2. Call grok-4.3.
  3. Choose reasoning effort from none to high.
  4. Provide text or image input.
  5. Add function tools or structured outputs as required.
Copy and try

Example prompts

  • Analyze this long document set and produce a concise action plan.
  • Use the available tools to complete this task.
  • Review this screenshot and explain the implementation issue.
Capabilities

What it can do

  • 1M context
  • Image input
  • Function calling
  • Structured outputs
  • Configurable reasoning
  • Batch API
Best for

Practical use cases

  • Coding agents
  • Research
  • Customer support
  • Long-document analysis
  • Multimodal assistants
Pricing

What does it cost?

Grok 4.3 costs $1.25 per 1M input tokens, $0.20 per 1M cached input tokens and $2.50 per 1M output tokens.

Input$1.25 / 1M tokens
Output$2.50 / 1M tokens
Simple summaryStandard pricing is $1.25/M input and $2.50/M output, with lower cached-input pricing and batch discounts.

What stands out

  • 1M context
  • Low output price
  • Strong tool support
  • Configurable reasoning

Things to consider

  • Proprietary
  • Higher-context requests can use different pricing
  • No fine-tuning
Limitations

Important restrictions and trade-offs

  • Production agents require tool safeguards
  • Very long prompts can increase cost
  • Outputs need domain validation
SimplifyAITools verdict

Our editorial take

A major current xAI model and a natural high-demand page for users migrating from retired Grok 4.x endpoints.

References

Primary sources

  1. Open source 1 ↗
  2. Open source 2 ↗
  3. Open source 3 ↗
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