Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude 4 Sonnet
52
GPT-5.5
89
Verified leaderboard positions: Claude 4 Sonnet unranked · GPT-5.5 #2
Pick GPT-5.5 if you want the stronger benchmark profile. Claude 4 Sonnet only becomes the better choice if coding is the priority or you want the cheaper token bill.
Coding
+14.1 difference
Claude 4 Sonnet
GPT-5.5
$3 / $15
$5 / $30
40 t/s
N/A
1.33s
N/A
200K
1M
Pick GPT-5.5 if you want the stronger benchmark profile. Claude 4 Sonnet only becomes the better choice if coding is the priority or you want the cheaper token bill.
GPT-5.5 is clearly ahead on the provisional aggregate, 89 to 52. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5 is also the more expensive model on tokens at $5.00 input / $30.00 output per 1M tokens, versus $3.00 input / $15.00 output per 1M tokens for Claude 4 Sonnet. That is roughly 2.0x on output cost alone. GPT-5.5 is the reasoning model in the pair, while Claude 4 Sonnet is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. GPT-5.5 gives you the larger context window at 1M, compared with 200K for Claude 4 Sonnet.
GPT-5.5 is ahead on BenchLM's provisional leaderboard, 89 to 52.
Claude 4 Sonnet has the edge for coding in this comparison, averaging 72.7 versus 58.6. GPT-5.5 stays close enough that the answer can still flip depending on your workload.
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