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GPT-5.5 vs DeepSeek V3
Side-by-side intelligence, speed, price, benchmarks, strengths and weaknesses for GPT-5.5 and DeepSeek V3 — refreshed monthly.
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Spec
GPT-5.5
DeepSeek V3
Intelligence index↑ better
Winner82
67
Speed↑ better
Winner95 tok/s
90 tok/s
Time to first token↓ better
Winner0.42 s
0.45 s
Context window↑ better
Winner400k
64k
Max output↑ better
Winner16k
8k
Input price↓ better
$5.00 / 1M tokens
Winner$0.27 / 1M tokens
Output price↓ better
$15.00 / 1M tokens
Winner$1.10 / 1M tokens
Blended price↓ better
$7.50 / 1M tokens
Winner$0.48 / 1M tokens
License
Proprietary
Open source
Input modalities
text, image
text
Output modalities
text
text
Benchmark showdown
MMLU
GPT-5.5
90.2
DeepSeek V3
88.5
MMLU Pro
GPT-5.5
78.0
DeepSeek V3
75.9
GPQA
GPT-5.5
62.5
DeepSeek V3
59.1
MATH
GPT-5.5
89.1
DeepSeek V3
84.1
HumanEval
GPT-5.5
93.0
DeepSeek V3
89.5
Strengths, weaknesses and best-for
GPT-5.5
Strengths
- Best-in-class reasoning
- Huge 400k context
- Strong tool use and agents
Weaknesses
- Expensive vs Sonnet for non-reasoning tasks
- Higher latency than gpt-5.5-mini
Best for
- Agentic workflows
- Complex coding
- Hard math & research
DeepSeek V3
Strengths
- Best $/intelligence on the market
- Open weights
Weaknesses
- Smaller context vs newer models
Best for
- Production chatbots
- Code assistance
- High-volume APIs
Quick verdict
- Pick GPT-5.5 if you want it smarter, faster and longer context.
- Pick DeepSeek V3 if you want it cheaper.
Auto-generated from the spec sheet. Always validate on your own evals.
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