Head-to-head comparison across 1 benchmark categories
Claude Mythos Preview
84
GPT-5.4 Pro
90
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Claude Mythos Preview only becomes the better choice if you want the cheaper token bill.
Agentic
+8.4 difference
Claude Mythos Preview
GPT-5.4 Pro
$25 / $125
$30 / $180
N/A
74 t/s
N/A
151.79s
1M
1.05M
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Claude Mythos Preview only becomes the better choice if you want the cheaper token bill.
GPT-5.4 Pro is clearly ahead on the aggregate, 90 to 84. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro's sharpest advantage is in agentic, where it averages 89.3 against 80.9.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $25.00 input / $125.00 output per 1M tokens for Claude Mythos Preview. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 1M for Claude Mythos Preview.
GPT-5.4 Pro is ahead overall, 90 to 84.
GPT-5.4 Pro has the edge for agentic tasks in this comparison, averaging 89.3 versus 80.9. Claude Mythos Preview stays close enough that the answer can still flip depending on your workload.
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