Matt Shumer shares his impressions after a week of testing GPT-5.4, declaring it the best model in the world "by far." He argues it is so capable that it effectively ends the debate over which AI model to use for various tasks. Perhaps most notably, Shumer reveals that he barely uses Pro mode anymore, which he frames as a surprising shift given his known usage patterns. The post signals a significant leap in model quality from OpenAI, suggesting GPT-5.4 may represent a consolidation point where one model suffices for most use cases.

Matt Shumer shares his review of GPT-5, noting he has had access to the model since July 21st and has been using it as his daily driver. He describes GPT-5 as "clearly a big leap from previous models," though the full details of his review are truncated in this post. He references a more comprehensive, interactive review with artifacts linked in a follow-up tweet.

The post serves as a teaser for a deeper evaluation, positioning GPT-5 as a significant advancement in OpenAI's model lineup. Shumer's extended hands-on testing period lends credibility to his assessment, making this of interest to those tracking large language model progress and real-world AI performance benchmarks.