[AINews] SpaceXAI launches Grok 4.5, first Opus-class model post Cursor acquisition

2026-07-09 · Source: Latent.Space - Www.latent.space · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Software Development & Engineering, Emerging Technologies & Innovation · Depth: Intermediate, short

Summary

SpaceXAI, in partnership with Cursor, has launched Grok 4.5, an "Opus-class" frontier model designed specifically for coding and agent workflows. Positioned for capability-per-dollar rather than absolute benchmark supremacy, Grok 4.5 is 3x larger than its predecessor, Grok 4.3, at 1.5T parameters. It offers competitive pricing at \$2 per 1M input tokens and \$6 per 1M output tokens, with cache hits discounted by 75% to \$0.5 per 1M tokens. Initially featuring a 500k context window, it is expected to expand to 1M soon. Independent evaluations by Artificial Analysis rank Grok 4.5 #4 on their Intelligence Index with a score of 54, a 16-point improvement over Grok 4.3. It also achieved a top score of 33% on τ³-Banking and a Coding Agent Index score of 76, demonstrating near-frontier capability with superior efficiency.

Key takeaway

For AI Engineers and ML Directors evaluating frontier models for coding and agent development, Grok 4.5 presents a compelling cost-performance alternative. You should consider integrating Grok 4.5 into your workflows, especially if current solutions are too expensive or slow. Its competitive pricing of \$2/1M input and \$6/1M output tokens, combined with strong benchmark scores, offers a significant efficiency advantage. Explore its capabilities in Grok Build or Cursor to optimize your operational costs.

Key insights

Grok 4.5 delivers near-frontier AI capability with significantly improved cost-efficiency for coding and agent tasks.

Principles

• Prioritize capability-per-dollar over raw benchmark supremacy.
• Optimize token efficiency for lower operational costs.
• Tailor models for specific workflows like coding and agents.

In practice

• Integrate Grok 4.5 for cost-effective coding agent development.
• Utilize its vision input and configurable reasoning features.
• Explore its use in Grok Build/API, Cursor, and Hermes Agent.

Topics

• Grok 4.5
• Frontier Models
• Coding Agents
• AI Benchmarking
• Model Pricing
• xAI

Best for: CTO, VP of Engineering/Data, AI Architect, AI Engineer, Machine Learning Engineer, Director of AI/ML

Related on AIssential

• SpaceXAI and Cursor Launch Grok 4.5, Tout Lower Costs Than Rivals — Grok 4.5, a joint SpaceXAI/Cursor model, targets coding and agentic work with lower operational costs.
• SpaceXAI releases Grok 4.5, which Elon describes as an ‘Opus-class model’ — Grok 4.5 delivers Opus-class capabilities with significantly improved token efficiency and lower operational costs, challenging market leaders.
• SpaceX's Grok 4.5 launches at half the price of rivals — here's why that could rattle Anthropic and OpenAI — SpaceX's Grok 4.5 disrupts the AI coding market by prioritizing cost-efficiency and speed over raw benchmark dominance.
• Grok 4.5 — Everything You Need To Know — Grok 4.5 demonstrates significant performance gains and cost efficiency through architectural redesign and massive parameter scaling.
• Grok 4.5 is so cheap compared to Fable 5 and GPT 5.5 that benchmark gaps may not matter much — Grok 4.5 offers competitive performance at a significantly lower cost, challenging higher-priced LLMs.
• Grok 4.5 released for free — Grok 4.5 prioritizes real-world engineering productivity and efficiency over pure benchmark dominance.

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Editorial summary, takeaway, and curation by AIssential. Original article published by Latent.Space - Www.latent.space.