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OpenAI

GPT-5.4 Pro

VS
xAI

Grok 4.20

✍️ Analysis by:the whichllmmodel Editorial Team|📅 Updated: June 2026

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, Grok 4.20 is the premium intelligence choice, scoring 51.8% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: GPT-5.4 Pro is 21.8x cheaper to run. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, GPT-5.4 Pro offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of Grok 4.20 fully justifies the cost.

Model Specs

GPT-5.4 Pro

Benchmarks & Scores

Coding (swe-bench-pro)
N/A
Reasoning (gpqa-diamond)
67.6%

Cost & Performance

Cost (per 1M tokens)21.8x cheaper
$0.14Input: $0.05 | Output: $0.40
Speed
137 tps
Context Window
400k tokens
Model Specs

Grok 4.20

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
51.8%
Reasoning (gpqa-diamond)Winner (+22.4%)
90%

Cost & Performance

Cost (per 1M tokens)
$3.00Input: $2.00 | Output: $6.00
Speed1.7x faster
233 tps
Context WindowLarger
1M tokens
Read our data collection methodology

Frequently Asked Questions

GPT-5.4 Pro is cheaper than Grok 4.20. GPT-5.4 Pro has a blended cost of $0.14/1M tokens, which is about 21.8x cheaper than Grok 4.20 at $3.00/1M tokens.

Grok 4.20 is faster than GPT-5.4 Pro. Grok 4.20 generates 233 tokens per second (tps) compared to GPT-5.4 Pro which generates 137 tokens per second.

Grok 4.20 is better for coding tasks. It scores 51.8% on coding evaluations (swe-bench-pro) compared to GPT-5.4 Pro which scores N/A.

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