Grok 4.20 vs Grok 4.5
Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
Grok 4.5 leads for most workloads.
- Grok 4.20 offers ~4× the context window — choose it for very long inputs.
Based on BenchLM composite scores, July 2026.
Grok 4.20
68
Grok 4.5
75
Pick Grok 4.5 if you want the stronger benchmark profile. Grok 4.20 only becomes the better choice if you need the larger 2M context window.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | Grok 4.20 | Δ | Grok 4.5 |
|---|---|---|---|
| Agentic | 47.1 | → 36.2 | 83.3 |
| Coding | 61.1 | → 3.6 | 64.7 |
| Reasoning | 53.3 | — | — |
| Multimodal | 70.1 | — | — |
Operational Comparison
Grok 4.20
Grok 4.5
$2 / $6
$2 / $6
233 t/s
N/A
10.33s
N/A
2M
500K
Quick Verdict
Pick Grok 4.5 if you want the stronger benchmark profile. Grok 4.20 only becomes the better choice if you need the larger 2M context window.
Grok 4.5 is clearly ahead on the provisional aggregate, 75 to 68. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Grok 4.5's sharpest advantage is in agentic, where it averages 83.3 against 47.1. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 47.1% to 83.3%.
Grok 4.20 gives you the larger context window at 2M, compared with 500K for Grok 4.5.
Benchmark Deep Dive
Frequently Asked Questions (3)
Which is better, Grok 4.20 or Grok 4.5?
Grok 4.5 is ahead on BenchLM's provisional leaderboard, 75 to 68. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 47.1% and 83.3%.
Which is better for coding, Grok 4.20 or Grok 4.5?
Grok 4.5 has the edge for coding in this comparison, averaging 64.7 versus 61.1. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Grok 4.20 or Grok 4.5?
Grok 4.5 has the edge for agentic tasks in this comparison, averaging 83.3 versus 47.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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