GPT-4o mini vs Grok 4.20 Beta

Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.

Benchmark data for one or both models is coming soon. This page currently shows metadata and pricing where BenchLM has it, and score-level comparisons will populate as public benchmark results land.

BenchLM does not have sourced benchmark coverage for Grok 4.20 Beta yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.

Grok 4.20 Beta is priced at $2.00 input / $6.00 output per 1M tokens, versus $0.15 input / $0.60 output per 1M tokens for GPT-4o mini. Grok 4.20 Beta has the larger context window at 2M, compared with 128K for GPT-4o mini.

Quick Verdict

Benchmark data for GPT-4o mini and Grok 4.20 Beta is coming soon on BenchLM.

Agentic

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

58
Terminal-Bench 2.0
Coming soon
49
BrowseComp
Coming soon
44
OSWorld-Verified
Coming soon

Coding

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

87.2
HumanEval
Coming soon
65
SWE-bench Pro
Coming soon

Multimodal & Grounded

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

66
MMMU-Pro
Coming soon
53
OfficeQA Pro
Coming soon

Reasoning

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

49
LongBench v2
Coming soon
50
MRCRv2
Coming soon

Knowledge

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

82
MMLU
Coming soon
62
FrontierScience
Coming soon

Instruction Following

Coming soon

Benchmark data for this category is coming soon.

Multilingual

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

87
MGSM
Coming soon
68
MMLU-ProX
Coming soon

Mathematics

Coming soon

Benchmark data for this category is coming soon.

Frequently Asked Questions

Can I compare GPT-4o mini and Grok 4.20 Beta on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.

Why does this comparison show “coming soon”?

BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.

What data is available for GPT-4o mini and Grok 4.20 Beta today?

GPT-4o mini: $0.15 input / $0.60 output per 1M tokens Grok 4.20 Beta: $2.00 input / $6.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.

Last updated: March 12, 2026

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