OpenAIGPT-5.4 miniVSOpenAIGPT-5.6 Terra

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

Our Take

This matchup represents a clear tradeoff between peak intelligence and budget efficiency. GPT-5.6 Terra is noticeably superior (holding a 7.2% average lead in benchmarks), but it carries a significant 3.3x price premium. Choose GPT-5.6 Terra 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)3.3x cheaper

$1.69Input: $0.75 | Output: $4.50

Context Window

400k tokens

Model Specs

GPT-5.6 Terra

Website

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+9.0%)

63.4%

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

Reasoning (gpqa-diamond)Winner (+5.4%)

92.9%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$5.63Input: $2.50 | Output: $15.00

Context WindowLarger

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about GPT-5.4 mini vs GPT-5.6 Terra

GPT-5.4 mini is cheaper than GPT-5.6 Terra. GPT-5.4 mini has a blended cost of $1.69/1M tokens, which is about 3.3x cheaper than GPT-5.6 Terra at $5.63/1M tokens.

GPT-5.6 Terra is better for coding tasks on this benchmark. It scores 63.4% 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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