tokevenGPTvsDeepSeek
GPT 5.5 Pro vs DeepSeek Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5 Pro
FlagshipDeepSeek Flash
Fast / BudgetInput $/MTok
$30.00
$0.15
Output $/MTok
$180.00
$0.60
Cache discount
0% off
98% 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 Flash
Guidance
When to use GPT 5.5 Pro vs DeepSeek Flash
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 Flash when...
- -Cost matters: 100% 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 Flash
100K tokens
$7.50
$0.03Cheaper
1M tokens
$123.00
$0.28Cheaper
10M tokens
$1230.00
$2.85Cheaper
FAQ
When should I use GPT 5.5 Pro instead of DeepSeek Flash?
GPT 5.5 Pro and DeepSeek Flash perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is DeepSeek Flash cheaper than GPT 5.5 Pro?
Yes. DeepSeek Flash input costs $0.15/MTok vs $30.00/MTok for GPT 5.5 Pro, saving 100% on input.
What are the context window sizes for GPT 5.5 Pro and DeepSeek Flash?
GPT 5.5 Pro has a 1.1M token context window. DeepSeek Flash 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 Flash 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.