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DeepSeek

DeepSeek V4 Flash

VS
OpenAI

GPT-5.4 Pro

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

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, DeepSeek V4 Flash is the premium intelligence choice, scoring 49.1% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: GPT-5.4 Pro is 1.3x cheaper to run and delivers 1.3x 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 DeepSeek V4 Flash fully justifies the cost.

Model Specs

DeepSeek V4 Flash

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
49.1%
Reasoning (gpqa-diamond)Winner (+12.4%)
80%

Cost & Performance

Cost (per 1M tokens)
$0.17Input: $0.14 | Output: $0.28
Speed
109.1 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)1.3x cheaper
$0.14Input: $0.05 | Output: $0.40
Speed1.3x faster
137 tps
Context Window
400k tokens
Read our data collection methodology

Frequently Asked Questions

GPT-5.4 Pro is cheaper than DeepSeek V4 Flash. GPT-5.4 Pro has a blended cost of $0.14/1M tokens, which is about 1.3x cheaper than DeepSeek V4 Flash at $0.17/1M tokens.

GPT-5.4 Pro is faster than DeepSeek V4 Flash. GPT-5.4 Pro generates 137 tokens per second (tps) compared to DeepSeek V4 Flash which generates 109.1 tokens per second.

DeepSeek V4 Flash is better for coding tasks. It scores 49.1% on coding evaluations (swe-bench-pro) compared to GPT-5.4 Pro which scores N/A.

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