Anthropic · OpenAI · Claude · Cursor · SpaceX · Elon Musk · Decrypt
Elon Musk Confirms It Competes With Last Year's Claude Opus
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Elon Musk’s SpaceXAI released Grok 4.5 on Wednesday, its first public model since the SpaceAI merger closed in February and SpaceX's pending $60 billion deal to acquire Cursor.
Key facts
- Claude Opus 4.8, Anthropic's primary flagship, runs $5 input and $25 output
- GPT 5.6 Sol, OpenAI's new top-tier model that also launched Wednesday, is priced at $5 input and $30 output
- Grok 4.5 scored 53%, behind Claude Opus 4.8 at 59% and GPT 5.5 at 67%
- On SWE Bench Pro, another benchmark that measures a collection of software engineering problems scored by resolution rate, Grok 4.5 posted 64.7%, enough to beat GPT 5.5's 58.6% on that particular test
Summary
SpaceXAI released Grok 4.5 on July 8 at $2 per million input tokens and $6 per million output, less than half the price of comparable models from Anthropic and OpenAI. Elon Musk posted on X that the model is "roughly comparable to Opus 4.7," Anthropic's previous flagship, now superseded by Opus 4.8, while touting speed and cost over benchmark performance. Grok 4.5 is not available in the EU yet; SpaceXAI says European access is expected in mid-July. The company’s pitch isn't that it's the best model. Claude Opus 4.8, Anthropic's primary flagship, runs $5 input and $25 output.