Breaking

xAI Rolls Out Grok 4.5 to API and Console With 500K Context Window

July 8, 2026 at 14:03 EDT

Foundation Models
Software Dev & Coding
AI Agents

xAI announced on July 8, 2026 that it is rolling out its new model "Grok 4.5" across Grok Build, its API, and the xAI Console. The model offers a 500K-token context window, supports text-and-image input to text output, and is positioned for coding, agentic tasks, and knowledge work.

July 8, 2026 · xAI

Grok 4.5 Arrives — Built for Coding, Agents & Knowledge Work

xAI rolls out its "smartest model" across Grok Build, the API, and the Console — powered by the V9 foundation on the scale of 1.5 trillion parameters, with a 500K-token context window and text-plus-image input.

500K

token context window

1.5T

parameters (V9 foundation)

$2 / $6

per 1M input / output tokens

Pricing shift: Grok 4.3 → 4.5

Cost per 1M tokens (USD) — columns drawn to scale

INPUT

$1.25

4.3

$2.00

4.5

OUTPUT

$2.50

4.3

$6.00

4.5

Output tokens now cost 2.4× more — while context tightens from 1M to 500K, tuned for agentic coding. xAI leans on token efficiency to offset the higher rate.

Early praise

Fast responses and precise codebase-review recommendations; internal beta evals reportedly at or above Claude Opus.

Open questions

One benchmark cites Fable 5 Max 70.5% vs Grok 4.5 66.7%. Independent SWE-bench results and hallucination behavior remain unproven.

Rollout timeline

Jun 28 — private beta (SpaceX / Tesla) → Jul 8 — rollout: Grok Build · API · Console → Jul 9 — public launch expected

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