Grok 4.3
Previous cheap-frontier Grok — superseded as flagship by Grok 4.6 on 12 August 2026.
Read the full Grok 4.3 analysisContext
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)
- 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 index | 53 |
| gdpval aa | 1500 |
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)
Compare Grok 4.3
Grok 4.6 vs Grok 4.3
Grok 4.6 was the xAI flagship for long agent loops from 12 August 2026 until Grok 4.7 replaced it on 21 September 2026. Keep 4.3 when the $1.25/$2.50 band still fits. Do not treat published AA/vendor tables as SIS Model Arena winners.
Claude Fable 5 vs Grok 4.3
Different products. The 20× output-price gap means most stacks should run both — at different tiers.
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.