Breaking

SpaceXAI and Cursor Debut 'Grok 4.5' for Finance, Legal and Coding

July 8, 2026 at 13:42 EDT

Foundation Models
Software Dev & Coding
AI Agents

SpaceXAI, the AI arm of Elon Musk's SpaceX, has unveiled Grok 4.5, a new model co-developed with AI coding tool Cursor (Anysphere). Pitched at improved performance on finance, legal and coding tasks, it marks a push to gain ground on Anthropic and OpenAI.

SpaceXAI × Cursor · Grok 4.5

SpaceXAI unveils Grok 4.5, its first model co-built with Cursor

Tuned for finance, legal and coding, the joint model runs on the Colossus supercluster and takes aim at Anthropic and OpenAI — currently in private beta inside SpaceX and Tesla.

1.5T

V9 foundation parameters (~3× prior model)

$60B

SpaceX acquisition of Cursor, formalized June 2026

~2T

Next-gen model parameters expected in August

Parameter scale-up: 0.5T → 1.5T

The V9 base behind Grok 4.5 roughly triples the previous model.

0.5T

Prior model

1.5T

V9 (Grok 4.5)

How the joint model is built

xAI V9 base

1.5T parameters

→

Cursor dev data

SFT + RL supplemental

→

Grok 4.5

finance · legal · coding

Trained on the Colossus GPU supercluster · monthly model releases planned through 2026.

Anticipation

Coding tuning could reach Claude Opus level
Pairing with Cursor's agent harness may boost autonomous coding
Flywheel from the compute-and-data feedback loop

Cautions

No independent benchmarks — claims rest on self-evaluation
Questions over how supplemental training affects generalization
Possible shift in character from the earlier Composer line

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