Zero-Defect Code Synthesis
Achieve elite coding performance on SWE-bench by reasoning through complex inter-file dependencies in large repos.
claude-opus-4-1-20250805-thinking / web-search
Claude Opus 4.1 Thinking is Anthropic's flagship reasoning model. Built for complex code synthesis and logical deliberation, it uses a 500k context window to solve multi-file repository issues with unprecedented accuracy and reliability.
$ 12
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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-opus-4-1-20250805-thinking",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "What'\''s the weather in NYC?"
}
],
"tools": [
{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 5
}
]
}'Core Claude 4.1 Opus Features
Powerful tools designed for the most demanding agentic and reasoning workflows.
500k Context Window Recall
Process up to 500,000 tokens with near-perfect information retrieval across entire technical documentation sets.
Dynamic Web Search Filtering
Claude executes code to filter search results, keeping only relevant information to ground responses while saving tokens.
Active Reasoning Thinking Mode
Claude deliberates using an internal token budget to reduce logical errors in complex multi-step problems and code.
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 FAQ
Find answers regarding Claude 4.1 reasoning capabilities, pricing, and technical implementation for your code and data projects.
How does Claude Opus 4.1 Thinking handle code debugging?
Claude uses an internal reasoning budget to analyze inter-file dependencies before writing. This thinking process allows the model to identify subtle logic errors and architectural flaws that non-reasoning models miss. It achieved a 96.2% on HumanEval, making it an industry leader for complex repository refactoring and zero-day vulnerability detection across large-scale C++ or Rust codebases.
What are Claude 4.1 thinking tokens?
Thinking tokens are the internal deliberation steps Claude takes before generating a final response. On our platform, these are billed at the same rate as standard output tokens ($75.00 per 1M). You can control the depth of this reasoning by setting the budget_tokens parameter between 1024 and 4096, allowing you to balance accuracy with latency and cost requirements for specific logical tasks.
Does Claude support multimodal video inputs?
Yes, Claude 4.1 can process video at up to 60fps alongside images and PDFs. This enables advanced temporal reasoning, such as analyzing a mechanical failure from a video clip or synthesizing data across thousands of pages of technical schematics. Its native multimodal synthesis ensures that visual data is integrated directly into the logical thinking process for more accurate and grounded conclusions.
Can I use Claude for real-time web searches?
Claude features a new web search tool with dynamic filtering. It can write and execute code to post-process search results, discarding irrelevant HTML and keeping only high-value data. This reduces token consumption and improves the grounding of responses. Note that this feature requires enabling the code execution tool and is available for $10 per 1,000 searches plus standard token costs.
How do I migrate to Claude Opus 4.1 on GPTProto?
To upgrade, simply update your model ID to 'claude-opus-4-1-20250805-thinking' in your API calls. If you are coming from Claude 3.5, you can optionally include the thinking block in your JSON payload to enable active reasoning. Our platform ensures OpenAI-compatible schemas, making the transition seamless while providing unified billing and multi-region failover protection for your applications.
Is data sent to Claude used for training?
No. Anthropic and GPTProto maintain strict privacy standards. Any data processed through our API is never used to train Claude or any other underlying models. We also offer Zero Data Retention (ZDR) eligibility for qualifying enterprise customers, ensuring that your proprietary codebases and sensitive financial data remain completely confidential and secure during the entire processing cycle.
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