Verified against the provider's official pricing page on Oct 9, 2026. Official pricing page
Monthly cost by workload
Workload
Claude Sonnet 5.5
Gemini 3.8 Flash
Chatbot1,000 in / 500 out tokens, 10,000 requests a day
$2,100/mo
$787.50/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day
$3,150/mo
$1,181/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input
$1,320/mo
$540.00/mo
Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.
Context and capabilities
Claude Sonnet 5.5
Gemini 3.8 Flash
Context
1,000,000 tokens
1,048,576 tokens
Max output
128,000 tokens
65,536 tokens
Input
text, image, pdf
text, image, video, audio, pdf
Tool calling
Yes
Yes
Reasoning
Yes
Yes
Structured outputs
Yes
Yes
Questions
What is the price difference between Claude Sonnet 5.5 and Gemini 3.8 Flash?
Claude Sonnet 5.5: $2.00 per 1M input tokens and $10.00 per 1M output tokens. Gemini 3.8 Flash: $0.75 per 1M input tokens and $3.75 per 1M output tokens. For the Chatbot workload (1,000 in / 500 out tokens, 10,000 requests a day), that is about $2,100 per month for Claude Sonnet 5.5 and $787.50 for Gemini 3.8 Flash.
Which has the longer context window, Claude Sonnet 5.5 or Gemini 3.8 Flash?
Gemini 3.8 Flash has the longer context window: up to 1,048,576 tokens, compared with 1,000,000 for Claude Sonnet 5.5.
Do Claude Sonnet 5.5 and Gemini 3.8 Flash have prompt caching and batch prices?
Claude Sonnet 5.5: cached input $0.10 per 1M tokens; batch $1.00 per 1M input tokens and $5.00 per 1M output tokens. Gemini 3.8 Flash: cached input $0.075 per 1M tokens; batch $0.375 per 1M input tokens and $1.875 per 1M output tokens.