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Gemini 3.5 Flash

VS
OpenAI

GPT-5.4 Pro

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

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, Gemini 3.5 Flash is the premium intelligence choice, scoring 55.1% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: GPT-5.4 Pro is 24.5x 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 Gemini 3.5 Flash fully justifies the cost.

Model Specs

Gemini 3.5 Flash

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
55.1%
Reasoning (gpqa-diamond)Winner (+24.6%)
92.2%

Cost & Performance

Cost (per 1M tokens)
$3.38Input: $1.50 | Output: $9.00
Speed2.0x faster
280 tps
Context WindowLarger
1M tokens
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)24.5x cheaper
$0.14Input: $0.05 | Output: $0.40
Speed
137 tps
Context Window
400k tokens
Read our data collection methodology

Frequently Asked Questions

GPT-5.4 Pro is cheaper than Gemini 3.5 Flash. GPT-5.4 Pro has a blended cost of $0.14/1M tokens, which is about 24.5x cheaper than Gemini 3.5 Flash at $3.38/1M tokens.

Gemini 3.5 Flash is faster than GPT-5.4 Pro. Gemini 3.5 Flash generates 280 tokens per second (tps) compared to GPT-5.4 Pro which generates 137 tokens per second.

Gemini 3.5 Flash is better for coding tasks. It scores 55.1% on coding evaluations (swe-bench-pro) compared to GPT-5.4 Pro which scores N/A.

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