Question 1

Does Fivo work with Claude 3.5 Sonnet?

Accepted Answer

Yes. Full support for Claude 3.5 Sonnet including chat messages, tool use, system prompts, streaming, and extended thinking. Save up to 150x on Claude 3.5 Sonnet costs.

Question 2

Does Fivo work with Claude 3 Opus?

Accepted Answer

Yes. Claude 3 Opus is fully supported. Opus queries are expensive ($0.015-$0.075 each), so Fivo delivers the highest absolute savings � often $10,000+/month for Opus-heavy workloads.

Question 3

Does Fivo work with Claude 3 Haiku?

Accepted Answer

Yes. Claude 3 Haiku is supported. While Haiku is already cheap, Fivo still delivers 5-25x additional savings, especially for high-volume workloads.

Question 4

Does Fivo support Claude tool use?

Accepted Answer

Yes. Full support for Claude tool use (function calling). Tool definitions, tool_choice parameters, and tool response parsing all work identically through Fivo.

Question 5

Does Fivo support Claude extended thinking?

Accepted Answer

Yes. Claude's extended thinking (chain-of-thought) feature is supported. Thinking tokens are handled transparently. Repeated thinking patterns benefit from optimization.

Question 6

How do I set up Fivo with the Anthropic Python SDK?

Accepted Answer

Change the base_url parameter: client = Anthropic(base_url='https://api.Fivo.dev/anthropic'). All other code stays the same. Works with the official Anthropic Python and TypeScript SDKs.

Question 7

Can Fivo route between Claude and GPT-4o?

Accepted Answer

Yes. Fivo can automatically select the best model across Anthropic, OpenAI, Google, and others based on query complexity. Simple queries route to cheaper models; complex queries stay on your preferred model.

Question 8

Does Fivo support Claude system prompts?

Accepted Answer

Yes. System prompts are handled as part of the request and benefit from optimization when the system + user prompt combination matches previous queries.

Question 9

Does Fivo affect Claude response quality?

Accepted Answer

No. 99%+ accuracy � identical responses. Same reasoning quality, same tool use behavior. The only differences: up to 150x cheaper and up to 300x faster for optimized queries.

Question 10

How much can I save on Claude with Fivo?

Accepted Answer

30-150x depending on model and query patterns. Claude 3 Opus users save the most in absolute terms � a team spending $20,000/month on Opus typically reduces to $200-$2,000/month.

Question 11

Does Fivo support Claude vision (image inputs)?

Accepted Answer

Yes. Image inputs in Claude messages are supported. Images are passed through when optimization is not applicable. Text-only portions of multi-modal conversations are optimized normally.

Question 12

Can I use Fivo with Claude in LangChain?

Accepted Answer

Yes. Change the base URL in your ChatAnthropic or ChatOpenAI (with Claude model) configuration. Works with LangChain, LangGraph, and all ecosystem tools.

Question 13

What happens if Anthropic is down?

Accepted Answer

Fivo automatically routes to alternative providers (GPT-4o, Gemini) as fallback. Your application keeps working. When Anthropic recovers, queries route back automatically.

Question 14

Does Fivo support Claude's Messages API format?

Accepted Answer

Yes. Full Messages API support including multi-turn conversations, tool results, and content blocks. Response format is byte-compatible with the Anthropic API.

Question 15

Is there a free plan for Claude users?

Accepted Answer

Yes. Fivo Starter is free forever � 1,000 queries/day including Claude models. Pro at $99/month gives unlimited queries. Average Claude user saves $3,000+/month on Pro.

Model	Direct Cost	With Fivo	Savings
Claude 3.5 Sonnet	$0.003�$0.015	~$0.0001	30-150x
Claude 3 Opus	$0.015�$0.075	~$0.0005	30-150x
Claude 3 Haiku	$0.00025�$0.00125	~$0.00005	5-25x

Fivo + Anthropic Claude FAQ

Claude Model Savings