Long-context analysis
Review large document collections, transcripts, repositories, or other inputs that fit within a one-million-token context window.
Independent tool overview
Grok 4.3 at a glance
Grok 4.3 is an xAI API model built for fast, cost-efficient agents, long-context analysis, instruction following, and tool use.
Visit the official Grok 4.3 site ↗.jpeg&w=3840&q=75)
- Developer model
- grok-4.3
- Inputs
- Text and images
- Output
- Text
- Context window
- 1,000,000 tokens
- Reasoning levels
- None, low, medium, and high
- Standard API price
- $1.25 input / $2.50 output per 1M tokens
Overview
What Grok 4.3 is
Grok 4.3 is a text-and-image input model in the xAI API. It is aimed at developers building agents, assistants, document workflows, and other applications that need reliable instruction following and tool calling without top-tier model pricing.
Its headline specification is a 1,000,000-token context window. Developers can also choose none, low, medium, or high reasoning effort, which makes the same model usable for both quick extraction tasks and more deliberate multi-step work.
This page covers the developer model rather than the broader Grok consumer app. xAI also makes Grok 4.3 available through Amazon Bedrock, while the direct xAI API exposes its own pricing, caching, batch processing, and rate limits.
Use cases
Who Grok 4.3 is best for
The strongest fit depends on the job you need the product to complete, not the size of its feature list.
Tool-using agents
Build workflows that call functions and return structured data rather than relying on unstructured chat alone.
Cost-sensitive production apps
Use a capable frontier-family model at lower token rates than many premium reasoning models.
Variable-complexity workloads
Set reasoning effort per request so simple work can prioritize speed and harder tasks can receive more deliberation.
Capabilities
Core Grok 4.3 features
One-million-token context
Accepts up to 1,000,000 tokens for large inputs and extended conversations.
Configurable reasoning
Supports none, low, medium, and high reasoning effort rather than forcing one latency and depth profile.
Function calling
Connects the model to application tools, APIs, and external systems.
Structured outputs
Can return responses in a developer-defined schema for more reliable automation.
Multimodal input
Understands text and image inputs while producing text responses.
Cached and batch pricing
xAI offers discounted cached-input rates and lower batch rates for suitable asynchronous workloads.
Process
How the Grok 4.3 workflow works
Step 1
Create an xAI API account
Set up a team, add billing, and generate an API key in the xAI Console.
Step 2
Choose grok-4.3
Use the stable model name or its latest alias in a supported SDK or direct API request.
Step 3
Set reasoning effort
Choose none for maximum speed or low, medium, or high based on the task's difficulty.
Step 4
Add tools or schemas
Define callable functions or a structured response format when the workflow needs dependable automation.
Step 5
Control long-context costs
Track prompt length because requests at or above 200,000 tokens use xAI's higher long-context rates.
Step 6
Evaluate production behavior
Test accuracy, latency, tool selection, and failure handling on representative data before scaling usage.
Cost
Grok 4.3 pricing and free plan
Direct xAI API usage is token-based. Standard prompts below the long-context threshold cost $1.25 per million input tokens, $0.20 per million cached input tokens, and $2.50 per million output tokens. When a prompt reaches 200,000 tokens, xAI applies long-context rates to all tokens in that request.
Standard API
$1.25 input / $2.50 output per 1M tokens
Direct xAI API pricing for prompts below 200,000 tokens.
- Cached input: $0.20 per 1M tokens
- Text and image input
- Text output
- Usage-based billing
Long context
$2.50 input / $5 output per 1M tokens
Applies to the entire request once its prompt reaches 200,000 tokens.
- Cached input: $0.40 per 1M tokens
- Up to 1M-token context
- Threshold applies to prompt length
- Plan large requests carefully
Batch API
$0.625 input / $1.25 output per 1M tokens
Discounted processing for eligible asynchronous jobs.
- Cached input: $0.10 per 1M tokens
- 50% below standard token rates
- Best for non-interactive workloads
- Long-context batch pricing is higher
Pricing checked . Check current pricing at the source ↗
Assessment
Grok 4.3 strengths and limitations
Where it stands out
- Large one-million-token context window
- Low standard input and output token prices
- Reasoning effort can be tuned per request
- Supports function calling and structured outputs
- Available through both xAI and Amazon Bedrock
What to consider
- Long prompts at or above 200,000 tokens trigger higher rates for the full request
- It returns text rather than generating image or audio output
- Published benchmarks do not replace evaluation on your own workload
- API costs can still grow quickly with very large contexts or verbose outputs
- Consumer Grok subscriptions and API billing are separate products
Compare
Grok 4.3 alternatives
The right alternative depends on the specific output, workflow, controls and budget your project requires.
Consumer
Grok 4.5
Consider xAI's newer model when higher capability matters more than Grok 4.3's lower standard pricing.
Explore Grok 4.5 →Consumer
Claude Opus 4.6
Consider Claude for a different long-context and agentic model ecosystem.
Explore Claude Opus 4.6 →Agents
OpenAI Frontier
Consider OpenAI's developer platform when its model and tool ecosystem better fits the application.
Explore OpenAI Frontier →Questions
Grok 4.3 FAQs
What is Grok 4.3?
Grok 4.3 is xAI's fast, cost-efficient developer model for text and image understanding, long-context analysis, instruction following, reasoning, and tool use.
How much does Grok 4.3 cost?
For standard direct xAI API requests, it costs $1.25 per million input tokens, $0.20 per million cached input tokens, and $2.50 per million output tokens. Long-context and batch requests use different rates.
What is the Grok 4.3 context window?
The model supports a context window of up to 1,000,000 tokens.
Does Grok 4.3 support images?
Yes. It accepts text and image inputs and produces text output.
Does Grok 4.3 support reasoning controls?
Yes. Developers can set reasoning effort to none, low, medium, or high.
Is Grok 4.3 the same as the Grok chatbot?
No. Grok 4.3 is a specific model available to developers, while Grok is the broader consumer application and product experience.
Can I use Grok 4.3 on Amazon Bedrock?
Yes. xAI announced Grok 4.3 availability through Amazon Bedrock in supported regions.
Bottom line
Our Grok 4.3 verdict
Grok 4.3 is a strong fit for developers who want long context, tool calling, and selectable reasoning at an unusually low standard token price. The main budgeting catch is xAI's separate long-context rate once prompts reach 200,000 tokens.
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