Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.3 Codex
85
Laguna M.1
51
Pick GPT-5.3 Codex if you want the stronger benchmark profile. Laguna M.1 only becomes the better choice if you want the cheaper token bill.
Agentic
+25.7 difference
Coding
+4.5 difference
GPT-5.3 Codex
Laguna M.1
$1.75 / $14
$0 / $0
79 t/s
N/A
88.26s
N/A
400K
131K
Pick GPT-5.3 Codex if you want the stronger benchmark profile. Laguna M.1 only becomes the better choice if you want the cheaper token bill.
GPT-5.3 Codex is clearly ahead on the provisional aggregate, 85 to 51. 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 45.8. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 77.3% to 45.8%.
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 Laguna M.1. That is roughly Infinityx on output cost alone. GPT-5.3 Codex gives you the larger context window at 400K, compared with 131K for Laguna M.1.
GPT-5.3 Codex is ahead on BenchLM's provisional leaderboard, 85 to 51. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 77.3% and 45.8%.
GPT-5.3 Codex has the edge for coding in this comparison, averaging 63.1 versus 58.6. 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 45.8. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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