Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Grok 4.20
77
MiMo-V2.5
74
Pick Grok 4.20 if you want the stronger benchmark profile. MiMo-V2.5 only becomes the better choice if agentic is the priority or you want the cheaper token bill.
Agentic
+18.7 difference
Coding
+4.9 difference
Multimodal
+2.7 difference
Grok 4.20
MiMo-V2.5
$2 / $6
$0.4 / $2
233 t/s
N/A
10.33s
N/A
2M
1M
Pick Grok 4.20 if you want the stronger benchmark profile. MiMo-V2.5 only becomes the better choice if agentic is the priority or you want the cheaper token bill.
Grok 4.20 has the cleaner provisional overall profile here, landing at 77 versus 74. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Grok 4.20's sharpest advantage is in coding, where it averages 61 against 56.1. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 47.1% to 65.8%. MiMo-V2.5 does hit back in agentic, so the answer changes if that is the part of the workload you care about most.
Grok 4.20 is also the more expensive model on tokens at $2.00 input / $6.00 output per 1M tokens, versus $0.40 input / $2.00 output per 1M tokens for MiMo-V2.5. That is roughly 3.0x on output cost alone. Grok 4.20 gives you the larger context window at 2M, compared with 1M for MiMo-V2.5.
Grok 4.20 is ahead on BenchLM's provisional leaderboard, 77 to 74. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 47.1% and 65.8%.
Grok 4.20 has the edge for coding in this comparison, averaging 61 versus 56.1. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
MiMo-V2.5 has the edge for agentic tasks in this comparison, averaging 65.8 versus 47.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
MiMo-V2.5 has the edge for multimodal and grounded tasks in this comparison, averaging 77.9 versus 75.2. Inside this category, CharXiv is the benchmark that creates the most daylight between them.
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