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Grok 4.3

Fourth-best frontier intelligence at roughly the cheapest frontier price, with the fastest output in its tier.

Read the full Grok 4.3 analysis

Context

1M

Max output

—

Input /1M

$1.25

Output /1M

$2.50

Live pricing via OpenRouter

Best for

  • High-volume cost-sensitive inference (classification, extraction, summarization)
  • Latency-sensitive agentic tool loops
  • Native video-input and voice-cloning workflows

Watch out

Context window dropped 2M → 1M; per-token price doubles past 200K tokens in a single request; reasoning is always-on so trivial calls cost slightly more.

For creators. Native video input removes a transcription step for footage analysis; Custom Voices enables narration and conversational agents at a flat per-minute rate.

Benchmarks

aa intelligence index53
gdpval aa1500
output tokens per sec181.3

Capabilities

  • Always-on reasoning by default
  • 1M-token context window
  • Native video input (first for xAI API)
  • Custom Voices voice-cloning suite
  • Agentic tool use (web search, Python sandbox, PDF/Excel/PPTX generation)
  • Highest output throughput in its price tier (~181 tok/s)

Compare Grok 4.3

Grok 4.3 vs GPT-5.5

GPT-5.5 is clearly the stronger model; Grok 4.3 delivers a large share of the capability at roughly a fifth of the price — the budget-frontier default.

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Grok 4.1

Sources