Breaking

SpaceXAI to Open Grok 4.5 to the Public on July 9

July 8, 2026 at 02:40 EDT

Foundation Models
Software Dev & Coding

Elon Musk said on July 8 that SpaceXAI will release its foundation model "Grok 4.5" to the public the next day, July 9. He described it as an "Opus-class" model that matches Anthropic's Claude Opus in performance while being faster, cheaper, and more token-efficient.

July 8, 2026 · SpaceXAI

Grok 4.5 Goes Public — Musk Calls It "Opus-Class"

SpaceXAI's ninth-generation foundation model launches July 9, pitched as a rival to Claude Opus — but faster, cheaper, and more token-efficient. Independent benchmarks remain unconfirmed.

1.5T

Parameters in the V9 foundation model

Ninth-generation foundation model

Jul 9

Planned public release date

From internal beta to public launch in ~11 days

Same unit: days along the release timeline

Jun 28

Internal beta
(SpaceX / Tesla)

→

Jul 9

Public release
(web · X · API)

What powers it

Cursor data

Supplemental training from the AI code editor to sharpen coding & agent use.

Grok Build harness

Strengthened coding-agent base for real-world development tasks.

Colossus cluster

One of the world's largest clusters — training new models on a monthly cadence.

Why developers are excited

Opus-class quality, but cheaper and faster
More token-efficient for high-volume use
Signals the AI race will accelerate further

Why to stay cautious

No public benchmarks confirmed (LMSYS Arena, SWE-bench)
Performance rests on Musk's own claims
Real evaluation only possible after launch

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