GoogleGemini 3.5 FlashVSOpenAIGPT-5.4
Our Take
We recommend Gemini 3.5 Flash for a 1.7x API cost saving at identical performance levels. While both models deliver similar intelligence, Gemini 3.5 Flash is the optimal choice for high-volume pipelines. Choose Gemini 3.5 Flash for budget efficiency without sacrificing quality.
▶WHY?
Benchmark Calculations & Evidence:
Performance Match: Both models perform almost identically, with an average score gap of just 1.6% across reasoning and coding benchmarks.
Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Gemini 3.5 Flash scored 55.1%, while GPT-5.4 scored 57.7%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3.5 Flash scored 92.2%, while GPT-5.4 scored 92.8%.
Cost Efficiency: Gemini 3.5 Flash pricing ($1.5/M input, $9/M output) is 1.7x cheaper than GPT-5.4 ($2.5/M input, $15/M output).
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Benchmarks & Scores
Coding (swe-bench-pro)
55.1%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)
92.2%graduate-level science QA
Cost & Context
Cost (per 1M tokens)1.7x cheaper
$3.38Input: $1.50 | Output: $9.00Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)Winner (+2.6%)
57.7%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+0.6%)
92.8%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$5.63Input: $2.50 | Output: $15.00Context WindowLarger
1.05M tokensFrequently Asked Questions about Gemini 3.5 Flash vs GPT-5.4
Gemini 3.5 Flash is cheaper than GPT-5.4. Gemini 3.5 Flash has a blended cost of $3.38/1M tokens, which is about 1.7x cheaper than GPT-5.4 at $5.63/1M tokens.
GPT-5.4 is better for coding tasks on this benchmark. It scores 57.7% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to Gemini 3.5 Flash which scores 55.1%.
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