SOTA Coding with Claude Opus 4.1 API
Achieve 96.2% on HumanEval. Claude Opus 4.1 resolves GitHub issues and identifies vulnerabilities in large-scale C++ or Rust codebases easily.
claude-opus-4-1-20250805-thinking
Claude Opus 4.1 is the premier thinking model for complex reasoning. Using its advanced API, developers tackle zero-defect coding and deep scientific synthesis with a 500k context window, ensuring logical consistency in every agentic workflow.
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API
Text To Text
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-opus-4-1-20250805-thinking",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "Who are you?"
}
]
}'Claude Opus 4.1 Key Capabilities
Experience the most advanced reasoning features available in the Claude Opus 4.1 thinking API, designed for high-precision enterprise tasks.
Massive 500k Context Claude Window
Analyze up to 500,000 tokens with perfect recall. Perfect for legal discovery or pharmaceutical research involving massive datasets and Claude documents.
Native Multimodal Claude API Support
Process images, PDFs, and video at 60fps. Claude Opus 4.1 performs temporal reasoning on visual data to explain failures or trends for Claude users.
Elite Claude 4.1 Thinking and Logic
Claude 4.1 uses an internal reasoning budget to solve multi-step problems, reducing logical errors in scientific modeling with Claude precision.
How to Get a claude-opus-4-1-20250805-thinking API Key
Getting a claude-opus-4-1-20250805-thinking 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 $12 / $60 it's a cheaper claude-opus-4-1-20250805-thinking API key than going direct, and one key works across every model on the platform. Full claude-opus-4-1-20250805-thinking 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-opus-4-1-20250805-thinking, 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-opus-4-1-20250805-thinking.
Make your first API call
Use your API key with our sample code to send a request to claude-opus-4-1-20250805-thinking via GPT Proto and see instant AI-powered results.
Claude Opus 4.1 Thinking API FAQ
How does the Claude Opus 4.1 thinking API work?
The Claude Opus 4.1 thinking API uses an internal reasoning budget to deliberate before finalizing an answer. This Claude active reasoning mode allows the model to verify its own logic and correct errors in real-time. By enabling the Claude thinking block in your API call, you allow Claude to process multi-step problems with a level of depth that standard Claude models cannot match, making it ideal for elite Claude coding and scientific synthesis.
What is the context window for Claude 4.1 Opus?
Claude Opus 4.1 features a massive 500,000-token context window. This expanded Claude capacity allows you to process entire codebases or long legal documents in a single request. Tests show near-perfect Claude information retrieval across the full range, ensuring that Claude never misses a detail in your data. This makes the 4.1 thinking API a powerful tool for large-scale Claude document analysis and complex Claude agentic workflows.
Is Claude Opus 4.1 better for coding than other models?
Yes, Claude Opus 4.1 is the industry leader for coding, scoring 96.2% on HumanEval. Its Claude thinking capabilities allow it to reason through inter-file dependencies and resolve complex Claude GitHub issues that trip up other models. When using the Claude API for software engineering, the model identifies subtle logic bombs and refactors legacy Claude modules for thread safety with professional-grade precision and Claude consistency.
What are the costs for the Claude 4.1 thinking API?
The Claude Opus 4.1 pricing is $15.00 per 1M input tokens and $75.00 per 1M output tokens. Tokens generated during the Claude thinking process are billed at the standard Claude output rate. While more expensive than 'mini' models, the high Claude reasoning density often reduces the number of iterations needed for complex projects, potentially lowering your total Claude spend on sophisticated AI tasks compared to using less capable models.
Does the thinking process increase Claude API latency?
Yes, because the Claude 4.1 thinking API takes time to deliberate, you will notice a higher Time-to-First-Token (TTFT) compared to non-reasoning Claude models. Typically, a 1024-token Claude thinking budget adds 2 to 5 seconds of latency. Consequently, Claude Opus 4.1 is best suited for offline tasks like Claude auditing or modeling where Claude accuracy is more important than immediate real-time responses, rather than simple Claude chat interfaces.
How do I integrate Claude 4.1 via GPTProto.com?
Integrating Claude Opus 4.1 via GPTProto.com is straightforward. We provide a unified, OpenAI-compatible Claude schema that lets you access the Claude thinking API with a single key. Our platform adds Claude value through multi-region failover and centralized Claude billing. To start, simply update your Claude model ID to the Opus 4.1 identifier and configure your Claude thinking token budget. We handle the Claude infrastructure for your team.
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