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OpenAI GPT-5.4 nano VS xAI Grok 4.5

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

⚖️Our Take

This matchup represents a clear tradeoff between peak intelligence and budget efficiency. Grok 4.5 is noticeably superior (holding a 11.3% average lead in benchmarks), but it carries a massive 6.5x price premium. Choose Grok 4.5 if you need top-tier reasoning or code debugging, but for high-volume pipelines, GPT-5.4 nano is the smarter business decision.
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Model Specs

GPT-5.4 nano

Benchmarks & Scores

Coding (swe-bench-pro)
52.4%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)
82.8%

graduate-level science QA

Cost & Performance

Cost (per 1M tokens)6.5x cheaper
$0.46Input: $0.20 | Output: $1.25
Context Window
400k tokens
Model Specs

Grok 4.5

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+12.3%)
64.7%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)Winner (+10.2%)
93%

graduate-level science QA

Cost & Performance

Cost (per 1M tokens)
$3.00Input: $2.00 | Output: $6.00
Context WindowLarger
500k tokens

Frequently Asked Questions about GPT-5.4 nano vs Grok 4.5 comparison

GPT-5.4 nano is cheaper than Grok 4.5. GPT-5.4 nano has a blended cost of $0.46/1M tokens, which is about 6.5x cheaper than Grok 4.5 at $3.00/1M tokens.

Grok 4.5 is better for coding tasks on this benchmark. It scores 64.7% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to GPT-5.4 nano which scores 52.4%.