Grok 4.3
xAI's documented default for general chat workloads, described in xAI docs as the most intelligent and fastest Grok model for non-specialized use cases.
Newer version: Grok 4.5
Provider
xAI
Model family
xAI Grok
LLM
Cost tier
Chat
Status
Current
Why teams choose it
Broad capability envelope
Useful when the same stack must cover chat, multimodal inputs, tooling, or structured-output shapes without juggling many SKUs.
Long-context analysis
Helps teams summarize, compare, and extract insights from long documents without losing important nuance.
Coding and tools
Works well for code assistance, tool calling, and agent workflows where instructions must stay consistent across steps.
Cost-efficient routing
Useful as part of a routing stack where cheap models handle drafts and confirmations and this tier handles genuinely hard passages.
Tradeoffs to know
- Verify exact API model IDs and unsupported fields in xAI docs before production rollout.
Technical specs
- Inputs
- text
- Outputs
- text
- Capabilities
- chat, reasoning, tool use
- License
- Proprietary API
Benchmarks
No independent or vendor benchmark scores in this catalog entry.
xAI Grok family lineup
Previous versions
Related models
Grok 4.3 FAQ
What is Grok 4.3?
xAI's documented default for general chat workloads, described in xAI docs as the most intelligent and fastest Grok model for non-specialized use cases.
When does Grok 4.3 fit best?
Reasoning workloads that already use xAI infrastructure
What should teams watch out for with Grok 4.3?
Verify exact API model IDs and unsupported fields in xAI docs before production rollout.
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