Today's price · per 1M tokens
Input
$2.00
per 1M tokens
Output
$6.00
per 1M tokens
Blended
$4.00
avg of input & output $/1M
Overview
xAI's smartest model — an Opus-class frontier model built for coding, agentic tasks, and knowledge work, trained on the 1.5T V9 foundation with Cursor data. ~2x token efficiency vs comparable leaders, 500K context, configurable reasoning effort. $2/$6 per 1M tokens.
Capabilities
struck through = not supportedBenchmark performance
accuracy % · higher is betterEvery per-benchmark score we hold for this model is reported by its own vendor, so none is counted toward an accuracy average or any ranking. The percentile above is its standing across the independent composites below.
- AA Intelligence Index: 53.8 (Artificial Analysis composite across reasoning, knowledge and coding evals)
- AA Agentic Index: 45.7 (Tool use, planning, autonomy)
- AA-Omniscience Index: 26.4 (−100–100)
- GDPval-AA v2: 1527.9 ELO (Real-world work tasks, human baseline = 1000)
- LMSYS Chatbot Arena: 1468.8 ELO (Human preference)
- Ranks #11 of 133 comparably-measured models by percentile score, across 5 independent measurements
- Ranks #73 of 133 comparably-tested models by normalized performance per dollar
88.2 tokens/sec output
Source: Artificial Analysis, LMSYS Chatbot Arena (UC Berkeley), xAI Grok 4.5 launch post · updated Jul 26, 2026 · See full rankings →
Specifications
- Provider
- xAI
- Context window
- 500K tokens
- Modality
- text, image
- Parameters
- Proprietary
- Open source
- No — proprietary
- Released
- Jul 8, 2026
- Status
- Current
- Last updated
- Jul 8, 2026
- Tags
Availability verified: Jul 8, 2026 — listed on xAI's own page