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OpenAI

GPT-5.4 Pro

VS
OpenAI

GPT-5.5 Pro

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

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, GPT-5.5 Pro is the premium intelligence choice, scoring 0.0% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: GPT-5.4 Pro is 490.9x cheaper to run and delivers 1.9x faster throughput. 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 GPT-5.5 Pro fully justifies the cost.

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)490.9x cheaper
$0.14Input: $0.05 | Output: $0.40
Speed1.9x faster
137 tps
Context Window
400k tokens
Model Specs

GPT-5.5 Pro

Benchmarks & Scores

Coding (swe-bench-pro)
N/A
Reasoning (gpqa-diamond)Winner (+28.6%)
96.2%

Cost & Performance

Cost (per 1M tokens)
$67.50Input: $30.00 | Output: $180.00
Speed
74 tps
Context WindowLarger
1.05M tokens
Read our data collection methodology

Frequently Asked Questions

GPT-5.4 Pro is cheaper than GPT-5.5 Pro. GPT-5.4 Pro has a blended cost of $0.14/1M tokens, which is about 490.9x cheaper than GPT-5.5 Pro at $67.50/1M tokens.

GPT-5.4 Pro is faster than GPT-5.5 Pro. GPT-5.4 Pro generates 137 tokens per second (tps) compared to GPT-5.5 Pro which generates 74 tokens per second.

Coding benchmark scores are not currently recorded for these models.

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