xAI: Grok 4.3
Analysis Summary
xAI: Grok 4.3 sits in the Frontier tier on our leaderboard, ranked #11 of 544 published models on overall intelligence. At $1.25 input and $2.50 output per 1M tokens, it is among the most expensive on the market. It offers an exceptionally large context window suited to long-document workflows and supports tool use, function calling, vision, and reasoning.
Editorial notes
Grok 4.3 from xAI reaches near-frontier intelligence with a 1M token context, vision, tool use, and strong instruction following at very competitive pricing for its capability tier.
Assessed May 5, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual..
Capabilities
Performance Indices
Source: Artificial Analysis
This model was released recently. Independent benchmark evaluations are typically completed within days of release — these figures are preliminary and are likely to be updated as testing is finalised.
Benchmark Scores
Intelligence
Technical
Content
Benchmark data from Artificial Analysis and Hugging Face
How does xAI: Grok 4.3 stack up?
Compare side-by-side with other frontier models.
Model Information
| OpenRouter ID |
x-ai/grok-4.3
|
| Provider | x-ai |
| Release Date | April 30, 2026 |
| Context Length | 1,000,000 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.25 | $0.001250 |
| Output | $2.50 | $0.002500 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
