200k Context Window
Ingest entire codebases or 100-page technical PDFs effortlessly. Maintain logic and nuance across massive datasets.
claude-sonnet-4-20250514 / web-search
Claude Sonnet 4 code optimization enables developers to build autonomous agents with Anthropic's latest 200k context model. Achieving 93.1% on HumanEval, it balances frontier intelligence with sub-second speeds and high-density logic.
$ 2.4
$ 3
text
$ 12
$ 15
text
API
Web Search
curl --request POST "https://gptproto.com/v1/messages" \
--header "Authorization: Bearer $GPTPROTO_API_KEY" \
--header "Content-Type: application/json" \
--header "anthropic-version: 2023-06-01" \
--data '{
"model": "claude-sonnet-4-20250514",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "What'\''s the weather in NYC?"
}
],
"tools": [
{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 5
}
]
}'Claude Sonnet 4 Code Features
Standout technical capabilities that separate Claude Sonnet 4 from the competition.
Sub-Second Speeds
Optimized for speed, delivering a 30% faster TTFT than Claude 3.5, perfect for real-time interactive apps.
Dynamic Web Filtering
The web_search_20260209 tool allows the model to filter live search results using code for maximum accuracy.
SOTA Agentic Planning
Claude 4 excels in multi-step planning, showing 25% better error recovery in tool use compared to previous versions.
How to Get a claude-sonnet-4-20250514 API Key
Getting a claude-sonnet-4-20250514 API key takes four steps and a few minutes. Create a free GPTProto account, add credits, generate your key, and make your first call — at $2.4 / $12 it's a cheaper claude-sonnet-4-20250514 API key than going direct, and one key works across every model on the platform. Full claude-sonnet-4-20250514 Documentation is in the docs.
Sign up
Create your free GPT Proto account to begin. You can set up an organization for your team at any time.
Top up
Your balance can be used across all models on the platform, including claude-sonnet-4-20250514, giving you the flexibility to experiment and scale as needed.
Generate your API key
In your dashboard, create an API key — you'll need it to authenticate when making requests to claude-sonnet-4-20250514.
Make your first API call
Use your API key with our sample code to send a request to claude-sonnet-4-20250514 via GPT Proto and see instant AI-powered results.
Claude Sonnet 4 Code FAQ
Expert answers regarding Claude Sonnet 4 capabilities, pricing, and integration steps.
What makes Claude Sonnet 4 code generation unique?
Claude Sonnet 4 code generation sets a new standard with a 93.1% HumanEval score. It focuses on production-grade reliability, specifically excelling at refactoring legacy codebases within its massive 200k context window. Unlike previous versions, it features lower hallucination rates for esoteric libraries and offers 25% better recovery from tool-calling errors, making it the most dependable choice for autonomous coding agents and IDEs.
Does Claude 4 Sonnet support multimodal data?
Yes, this model provides native multimodal support for images, PDFs, and video frames. It can interpret complex architectural diagrams, UI flowcharts, and technical documents exceeding 100 pages. This capability allows it to maintain spatial awareness when extracting data from visual sources like blueprints or medical charts, providing a comprehensive logic layer that goes far beyond simple optical character recognition.
What is the pricing for Claude Sonnet 4 via GPTProto?
Using Claude Sonnet 4 through GPTProto costs $3.00 per 1 million input tokens and $15.00 per 1 million output tokens. We offer significant cost-saving features, including prompt caching hits at $0.30 per 1 million tokens and a 50% discount for non-urgent tasks processed via our Batch API. Our platform provides immediate Tier 4 throughput, allowing you to bypass individual vendor ramp-up periods while enjoying unified billing.
How fast is the Claude 4 Sonnet response time?
This model is engineered for interactive applications where speed is critical. It delivers a Time-To-First-Token (TTFT) that is approximately 30% faster than the previous Claude 3.5 generation. For a standard 500-token response, the median latency is roughly 1.8 seconds. This sub-second initial response makes it ideal for customer support bots and real-time coding assistants that require immediate feedback loops.
Can this model search the web in real-time?
Yes, it supports the latest web search tool versions, including dynamic filtering. This allows the model to write and execute code to post-process search results before they enter the context window, reducing token noise and improving accuracy. This is particularly effective for technical research or verifying documentation. Each web search costs $10 per 1,000 requests, providing access to information beyond its knowledge cutoff.
Is user data used to train Claude models?
Privacy is a core pillar of our service. Inputs and outputs processed through the GPTProto API and the underlying Anthropic infrastructure are not used to train Claude models. Furthermore, our platform is eligible for Zero Data Retention (ZDR) configurations. This ensures that your proprietary code, sensitive business logic, and user interactions remain strictly confidential and protected by enterprise-grade security standards.
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