xAI: Grok 4.3
Analysis Summary
Grok 4.3 is a multimodal xAI model with a 1,000,000-token context window, vision, tool use, and function calling. Its measured coding performance is strong, while instruction-following, long-context, and tool-interaction results add evidence for dependable structured workflows. The general intelligence index is lower than frontier leaders, so its strongest case is practical coding and agentic work rather than a universal lead on difficult reasoning.
For an agency, it is a candidate for code assistance, tool-enabled research, long-document review, and workflows that combine files or images with text. The listed pricing is moderate, especially alongside the million-token context, and offers a useful balance for repeated work. Validate task accuracy and tool execution before allowing autonomous actions on production systems.
Adopt it as a strong general-purpose specialist where coding, context, and tool use matter, while reserving the hardest judgment calls for a higher-reasoning model.
Assessed September 23, 2026
Editorial notes
Grok 4.3 pairs a million-token context and multimodal tool calling with strong measured coding, instruction-following, and tool-interaction results; its general intelligence index is below the frontier tier.
The DFO score ranks models on the Artificial Analysis Intelligence Index and is refreshed as new models launch. The write-up and verdict are our own. Feedback?
DFO Verdict
Grok 4.3 pairs a million-token context and multimodal tool calling with strong measured coding, instruction-following, and tool-interaction results; its general intelligence index is below the frontier tier.
Benchmarks
Artificial Analysis data refreshed Sep 29, 2026. Arena ratings from the Sep 25, 2026 text leaderboard, with style control. Bars: magenta = reasoning, ink = coding and agents, cyan = instructions and long context.
How xAI: Grok 4.3 compares
XAI: Grok 4.3 ranks #80 of 431 AI models we track for overall intelligence, #81 of 198 for coding, #83 of 181 for agentic tasks. Its 1M-token context window is larger than 86% of the models we list. At $1.25 per million input tokens it is cheaper than 21% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.25 | $0.001250 |
| Output | $2.50 | $0.002500 |
What would xAI: Grok 4.3 cost your business?
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A website chatbot handling around 100 customer conversations a day, a few short messages each.
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Talk to our teamAbout xAI: Grok 4.3
Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual..
Frequently asked questions about xAI: Grok 4.3
How much does xAI: Grok 4.3 cost?
xAI: Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens.
What is the context window of xAI: Grok 4.3?
xAI: Grok 4.3 has a context window of 1,000,000 tokens (1M).
Is xAI: Grok 4.3 good for coding?
On our coding benchmark index, xAI: Grok 4.3 ranks #81 of 198 models, placing it in the broader range of the field for code generation and debugging.
What can xAI: Grok 4.3 do?
xAI: Grok 4.3 supports image/vision input, tool use, and function calling.
Who created xAI: Grok 4.3?
xAI: Grok 4.3 is developed by xAI and was released on April 30, 2026.