SpaceXAI releases Grok 4.5, which Elon describes as an Opus-class model

The company released benchmark metrics Wednesday that appeared to show Grok’s competitiveness with other top models from SpaceXAI competitors, although just short of best-in-class:

Image Credits:SpaceXAI

In a post on his social media platform X (which is a subsidiary of SpaceXAI), founder Elon Musk compared the model to Opus, Anthropic LLM designed for intensive and complex tasks.

“Based on strong positive feedback from customers in our beta test program, @SpaceXAI will make Grok 4.5 available to the public tomorrow. It is an Opus-class model, but faster, more token-efficient and lower cost,” wrote Musk in a post on X.

Musk later added: “Our internal assessment is that Grok 4.5 is roughly comparable to Opus 4.7, but much faster. The combination of capability, faster speed and lower cost is what makes it competitive.”

SpaceXAI says that its new model costs $2 per million input tokens and $6 per million output tokens. That’s quite competitive, if Grok’s capabilities match SpaceXAI’s rhetoric.

Opus 4.7, by comparison, costs $5 per million input tokens, and $25 per million output tokens. OpenAI has tiered costs for different model versions: Sol, its most expensive, costs $5 for input tokens and $30 for output, while its least expensive, Luna, costs $1 for input and $6 for output.

It’s a big week for AI model releases. OpenAI is planning to release GPT 5.6, its latest, most powerful model, on Thursday. The release of that model had previously been limited by the Trump administration, due to concerns about its security implications. OpenAI has called it its “strongest model yet.”

When you purchase through links in our articles, we may earn a small commission. This doesn’t affect our editorial independence.

Lucas is a senior writer at TechCrunch, where he covers artificial intelligence, consumer tech, and startups. He previously covered AI and cybersecurity at Gizmodo.

You can contact Lucas by emailing lucas.ropek@techcrunch.com.

View Bio