OpenAIGPT-5.4 miniVSOpenAIGPT-5.5

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

Our Take

This matchup represents a clear tradeoff between peak intelligence and budget efficiency. GPT-5.5 is noticeably superior (holding a 5.1% average lead in benchmarks), but it carries a massive 6.7x price premium. Choose GPT-5.5 if you need top-tier reasoning or code debugging, but for high-volume pipelines, GPT-5.4 mini is the smarter business decision.

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Model Specs

GPT-5.4 mini

Website

Benchmarks & Scores

Coding (swe-bench-pro)

54.4%

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

Reasoning (gpqa-diamond)

87.5%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)6.7x cheaper

$1.69Input: $0.75 | Output: $4.50

Context Window

400k tokens

Model Specs

GPT-5.5

Website

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+4.2%)

58.6%

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

Reasoning (gpqa-diamond)Winner (+6.1%)

93.6%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$11.25Input: $5.00 | Output: $30.00

Context WindowLarger

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about GPT-5.4 mini vs GPT-5.5

GPT-5.4 mini is cheaper than GPT-5.5. GPT-5.4 mini has a blended cost of $1.69/1M tokens, which is about 6.7x cheaper than GPT-5.5 at $11.25/1M tokens.

GPT-5.5 is better for coding tasks on this benchmark. It scores 58.6% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to GPT-5.4 mini which scores 54.4%.

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