tokevenGPTvsDeepSeek
GPT 5.5 Pro vs DeepSeek V4 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5 Pro
FlagshipDeepSeek V4 Pro
FlagshipInput $/MTok
$30.00
$0.66
Output $/MTok
$180.00
$1.98
Cache discount
0% off
97% off
Context
1.1M
1M
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
0
vs
0
Code Review
0
vs
0
Summarization
0
vs
0
Q&A
0
vs
0
Extraction
0
vs
0
Reasoning
0
vs
0
Classification
0
vs
0
Creative Writing
0
vs
0
GPT 5.5 Pro
DeepSeek V4 Pro
Guidance
When to use GPT 5.5 Pro vs DeepSeek V4 Pro
Choose GPT 5.5 Pro when...
- -You need a larger context window (1.1M vs 1M)
- Similar performance; consider provider preference or ecosystem fit.
Choose DeepSeek V4 Pro when...
- -Cost matters: 98% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.5 Pro
DeepSeek V4 Pro
100K tokens
$7.50
$0.11Cheaper
1M tokens
$123.00
$1.06Cheaper
10M tokens
$1230.00
$10.56Cheaper
FAQ
When should I use GPT 5.5 Pro instead of DeepSeek V4 Pro?
GPT 5.5 Pro and DeepSeek V4 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is DeepSeek V4 Pro cheaper than GPT 5.5 Pro?
Yes. DeepSeek V4 Pro input costs $0.66/MTok vs $30.00/MTok for GPT 5.5 Pro, saving 98% on input.
What are the context window sizes for GPT 5.5 Pro and DeepSeek V4 Pro?
GPT 5.5 Pro has a 1.1M token context window. DeepSeek V4 Pro has a 1M token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How GPT 5.5 Pro and DeepSeek V4 Pro stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.