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.
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.
When not to use this
- Not ideal for simple tasks where cheaper models in the same lineup are good enough.
- Avoid for latency-sensitive real-time chat when raw response speed outweighs reasoning depth.
- Confirm limits, pricing, and regional availability on the provider side before committing production workloads.
Technical specs
- Inputs
- text
- Outputs
- text
- Capabilities
- chat, reasoning, tool use
- License
- Proprietary API
- Model string
grok-4-3
Benchmarks
No benchmark data yet.
xAI Grok family lineup
Current models
Previous versions