tokevenClaudevsDeepSeek
Claude Opus 5.5 vs DeepSeek Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 5.5
FlagshipDeepSeek Flash
Fast / BudgetInput $/MTok
$4.00
$0.15
Output $/MTok
$20.00
$0.60
Cache discount
95% off
98% off
Context
1M
1M
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
79
vs
0
Code Review
0
vs
0
Summarization
66
vs
0
Q&A
0
vs
0
Extraction
75
vs
0
Reasoning
92
vs
0
Classification
0
vs
0
Creative Writing
71
vs
0
Claude Opus 5.5
DeepSeek Flash
Guidance
When to use Claude Opus 5.5 vs DeepSeek Flash
Choose Claude Opus 5.5 when...
- Similar performance; consider provider preference or ecosystem fit.
Choose DeepSeek Flash when...
- -Cost matters: 96% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Opus 5.5
DeepSeek Flash
100K tokens
$0.88
$0.03Cheaper
1M tokens
$8.80
$0.28Cheaper
10M tokens
$88.00
$2.85Cheaper
FAQ
When should I use Claude Opus 5.5 instead of DeepSeek Flash?
Claude Opus 5.5 and DeepSeek Flash perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is DeepSeek Flash cheaper than Claude Opus 5.5?
Yes. DeepSeek Flash input costs $0.15/MTok vs $4.00/MTok for Claude Opus 5.5, saving 96% on input.
What are the context window sizes for Claude Opus 5.5 and DeepSeek Flash?
Claude Opus 5.5 has a 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 Claude Opus 5.5 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.