Breaking

xAI to Open Grok 4.5 on July 9, Built on 1.5T-Parameter V9

July 8, 2026 at 02:32 EDT

Foundation Models
Software Dev & Coding
AI Agents

xAI's Elon Musk said on July 8, 2026 that the large language model "Grok 4.5" will be made available to the public the next day, July 9. Citing beta feedback, he said it delivers "Opus-class" performance rivaling Anthropic's top-tier model, but faster and at lower cost.

Jul 8, 2026 · xAI

Grok 4.5 Goes Public July 9 — an "Opus-Class" Model, Faster and Cheaper

After a private beta inside SpaceX and Tesla, Elon Musk says the new model matches Anthropic's flagship Claude Opus — while running faster, using fewer tokens, and costing less.

1.5T

parameters in the V9 base model

~3×

the size of the previous V8 model

Jul 9

planned public release, 2026

Scale leap: V8 → V9

Each block ≈ 0.5 trillion parameters — V9 is roughly triple its predecessor.

~0.5T

1.5T

V9 (Grok 4.5)

How Grok 4.5 was built

V9 PRE-TRAINING

Completed May 26, 2026

→

CURSOR DATA

Coding-focused supplemental training

→

RL LOOP

Ongoing reinforcement learning

DEVELOPER OPTIMISM

Praise for token efficiency and lower cost — Opus-class performance potentially available more cheaply, arriving amid a wave of rival launches.

HEALTHY SKEPTICISM

No independent benchmarks yet. The performance claims remain claims until real-world use through the API and apps proves them out.

The strategy

Musk aims to ship "a completely new foundation model every month" through 2026 — Grok 4.5 is the first Grok to explicitly claim Opus-class status.

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