Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Grok 4.20
65
Qwen3.5-27B
63
Verified leaderboard positions: Grok 4.20 unranked · Qwen3.5-27B #16
Pick Grok 4.20 if you want the stronger benchmark profile. Qwen3.5-27B only becomes the better choice if reasoning is the priority or you want the cheaper token bill.
Agentic
+4.5 difference
Coding
+2.0 difference
Reasoning
+7.3 difference
Grok 4.20
Qwen3.5-27B
$2 / $6
$0 / $0
233 t/s
N/A
10.33s
N/A
2M
262K
Pick Grok 4.20 if you want the stronger benchmark profile. Qwen3.5-27B only becomes the better choice if reasoning is the priority or you want the cheaper token bill.
Grok 4.20 has the cleaner provisional overall profile here, landing at 65 versus 63. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Grok 4.20 is also the more expensive model on tokens at $2.00 input / $6.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Qwen3.5-27B. That is roughly Infinityx on output cost alone. Grok 4.20 gives you the larger context window at 2M, compared with 262K for Qwen3.5-27B.
Grok 4.20 is ahead on BenchLM's provisional leaderboard, 65 to 63. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 47.1% and 41.6%.
Qwen3.5-27B has the edge for coding in this comparison, averaging 63 versus 61. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Qwen3.5-27B has the edge for reasoning in this comparison, averaging 60.6 versus 53.3. Grok 4.20 stays close enough that the answer can still flip depending on your workload.
Qwen3.5-27B has the edge for agentic tasks in this comparison, averaging 51.6 versus 47.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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