xAI: Grok 4.3
Chatx-ai/grok-4.3Grok 4.3 is a reasoning model from xAI, released on 2026-04-30. It accepts text and image inputs with text output and is suited to agentic workflows, instruction-following tasks, and applications that require high factual accuracy. Capabilities include reasoning, vision, tool use (function calling), and prompt caching, so multi-step tool loops can reuse a shared context cheaply. Context window: 1M tokens, output: 128K. Pricing is $1.25/M input tokens and $2.50/M output tokens, with cached input reads at $0.20/M. Available via OpenAI and Anthropic protocols through Ofox.
Providers
/v1/chat/completions/v1/responsesCode Examples
from openai import OpenAIclient = OpenAI(base_url="https://api.ofox.run/v1",api_key="YOUR_OFOX_API_KEY",)response = client.chat.completions.create(model="x-ai/grok-4.3",messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)
Benchmarks
xAI: Grok 4.3 scores 1443 in the Overall category of the LMArena text leaderboard (style control), ranking #63 of 374 models based on 42,706 human preference votes (updated 2026-07-12).
| Category | Arena Score | 95% CI | Rank | Votes |
|---|---|---|---|---|
| Overall | 1443 | 1438–1447 | #63 of 374 | 42,706 |
| Hard Prompts | 1458 | 1452–1463 | #74 of 374 | 28,292 |
| Coding | 1488 | 1481–1495 | #66 of 369 | 12,055 |
| Math | 1416 | 1403–1430 | #98 of 362 | 2,127 |
| Creative Writing | 1428 | 1419–1436 | #53 of 372 | 7,218 |
| Instruction Following | 1414 | 1407–1420 | #95 of 374 | 14,510 |
| Chinese | 1489 | 1475–1503 | #52 of 344 | 2,069 |
Source: LMArena · CC BY 4.0 · Updated 2026-07-12 · Methodology ↗ · Ranks compare models within each category of the LMArena text leaderboard (style control). Scores come from third-party human preference evaluations, not from OFOX.