tokevenClaudevsGemini
Claude Opus 5 vs Gemini 3.5 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 5
FlagshipGemini 3.5 Flash
Fast / BudgetInput $/MTok
$5.00
$1.50
Output $/MTok
$25.00
$9.00
Cache discount
90% off
90% off
Context
1M
1.0M
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
72
vs
61
Code Review
0
vs
65
Summarization
65
vs
76
Q&A
0
vs
84
Extraction
73
vs
73
Reasoning
91
vs
82
Classification
0
vs
92
Creative Writing
61
vs
75
Claude Opus 5
Gemini 3.5 Flash
Guidance
When to use Claude Opus 5 vs Gemini 3.5 Flash
Choose Claude Opus 5 when...
- -You need strong reasoning (confidence 91 vs 82)
- -You need strong code generation (confidence 72 vs 61)
Choose Gemini 3.5 Flash when...
- -You need strong summarization (confidence 76 vs 65)
- -You need strong creative writing (confidence 75 vs 61)
- -Cost matters: 70% cheaper on input tokens
- -You need a larger context window (1.0M vs 1M)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Opus 5
Gemini 3.5 Flash
100K tokens
$1.10
$0.38Cheaper
1M tokens
$11.00
$3.75Cheaper
10M tokens
$110.00
$37.50Cheaper
FAQ
When should I use Claude Opus 5 instead of Gemini 3.5 Flash?
Claude Opus 5 outperforms Gemini 3.5 Flash for Code Generation, Reasoning. It costs $5.00/$25.00 per million tokens (input/output).
Is Gemini 3.5 Flash cheaper than Claude Opus 5?
Yes. Gemini 3.5 Flash input costs $1.50/MTok vs $5.00/MTok for Claude Opus 5, saving 70% on input.
What are the context window sizes for Claude Opus 5 and Gemini 3.5 Flash?
Claude Opus 5 has a 1M token context window. Gemini 3.5 Flash has a 1.0M 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 and Gemini 3.5 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.