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The DecoderJuly 8, 2026· 1 min read

Grok 4.5 is so cheap compared to Fable 5 and GPT 5.5 that benchmark gaps may not matter much

xAI has released Grok 4.5, a new AI model that trails behind Fable 5 and GPT-5.5 in coding benchmarks but is much cheaper. It's priced at $2 per million input tokens.

What happened

Grok 4.5 has been released by xAI, trained on a massive number of Nvidia GPUs. In benchmark tests, it performs worse than Fable 5 and GPT-5.5 but uses fewer input tokens. This makes it a more affordable option for users.

Why it matters

For businesses, the cost of using AI models can be a significant factor in decision-making. If Grok 4.5 is significantly cheaper than its competitors, it may be a more viable option despite its lower performance in benchmark tests. This could be especially relevant for smaller businesses or those with limited budgets.

The takeaway

You may want to consider Grok 4.5 if cost is a major constraint for your business. Its lower price point could make it a more attractive option, even if it doesn't perform as well as other models.

Read the original at The Decoder

Our plain-English take, written from public reporting for operational business owners. Always read the original for full context.

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