Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.3 Codex
87
Hy3 Preview
62
Pick GPT-5.3 Codex if you want the stronger benchmark profile. Hy3 Preview only becomes the better choice if you want the cheaper token bill.
Agentic
+17.1 difference
Coding
+3.1 difference
GPT-5.3 Codex
Hy3 Preview
$1.75 / $14
$0 / $0
79 t/s
N/A
88.26s
N/A
400K
256K
Pick GPT-5.3 Codex if you want the stronger benchmark profile. Hy3 Preview only becomes the better choice if you want the cheaper token bill.
GPT-5.3 Codex is clearly ahead on the provisional aggregate, 87 to 62. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.3 Codex's sharpest advantage is in agentic, where it averages 71.5 against 54.4. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 77.3% to 54.4%.
GPT-5.3 Codex is also the more expensive model on tokens at $1.75 input / $14.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Hy3 Preview. That is roughly Infinityx on output cost alone. GPT-5.3 Codex gives you the larger context window at 400K, compared with 256K for Hy3 Preview.
GPT-5.3 Codex is ahead on BenchLM's provisional leaderboard, 87 to 62. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 77.3% and 54.4%.
GPT-5.3 Codex has the edge for coding in this comparison, averaging 63.1 versus 60. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
GPT-5.3 Codex has the edge for agentic tasks in this comparison, averaging 71.5 versus 54.4. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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