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Grok 4.3

Frontier
xAIReasoninggrok-4.3

xAI flagship. 1M context; reasoning effort replaces the retired fast/mini tiers (set effort low for speed).

xAI retired its separate fast/mini tiers 2026-05; grok-4.3 with reasoning effort 'low'/'none' is the official replacement.

Capabilities

Tool callingVisionReasoningJSON modePrompt cache

Recommended for

  • reasoning
  • agentic tasks
  • current-events analysis

Using this model through Conduix

Call it by its id, or let a routing alias pick it as part of a governed, cross-provider chain with automatic failover.

Direct model idgrok-4.3

Reached by these routing aliases:

  • frontier-fastfallback #3 · Claude Sonnet 5 → GPT-5.4 → Gemini 3.5 Flash → Grok 4.3
  • reasoning-fastfallback #1 · Gemini 3.5 Flash → Grok 4.3 → GPT-5.4

Routing relationships are operational — chains adapt to provider availability and your org's policy — not a contractual guarantee that a specific model serves a given request.

Get started

Conduix is OpenAI-API-compatible — point any OpenAI SDK at https://api.conduix.ai/v1 and pass grok-4.3 as the model.

from conduix import Conduix

client = Conduix(api_key="cx_live_YOUR_KEY")  # base URL is built in

response = client.chat.completions.create(
    model="grok-4.3",
    messages=[{"role": "user", "content": "Hello, Conduix!"}],
)
print(response.choices[0].message.content)
  • Tool calling: Pass a tools array and the model calls your functions.
  • Vision: Accepts image inputs — add image_url parts to a message.
  • Reasoning: Reasons step-by-step — best for hard, multi-step problems.
  • JSON mode: Set response_format for guaranteed-valid JSON output.
  • Prompt cache: Repeated prompt context is billed at a reduced rate.

The response's x-conduix-model-served header tells you exactly which model answered. See the quickstart for keys, headers, and usage.