Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.3 Codex
86
MiMo-V2.5-Pro
86
Treat this as a split decision. GPT-5.3 Codex makes more sense if coding is the priority; MiMo-V2.5-Pro is the better fit if you need the larger 1M context window.
Agentic
+3.1 difference
Coding
+5.9 difference
GPT-5.3 Codex
MiMo-V2.5-Pro
$1.75 / $14
$null / $null
79 t/s
N/A
88.26s
N/A
400K
1M
Treat this as a split decision. GPT-5.3 Codex makes more sense if coding is the priority; MiMo-V2.5-Pro is the better fit if you need the larger 1M context window.
GPT-5.3 Codex and MiMo-V2.5-Pro finish on the same provisional overall score, so this is less about a single winner and more about where the edge shows up. The provisional headline says tie; the benchmark table is where the real choice happens.
MiMo-V2.5-Pro gives you the larger context window at 1M, compared with 400K for GPT-5.3 Codex.
GPT-5.3 Codex and MiMo-V2.5-Pro are tied on the provisional overall score, so the right pick depends on which category matters most for your use case.
GPT-5.3 Codex has the edge for coding in this comparison, averaging 63.1 versus 57.2. Inside this category, Terminal-Bench Hard 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 68.4. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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