Claude API & Models on GPTProto

Access Anthropic’s Opus-tier model at $4 per 1M input tokens and $20 per 1M output tokens. Claude Opus 5 is designed for repository-scale coding, long-horizon agents, and document-heavy enterprise work, with 1M context, 128K max output, vision, and adaptive thinking.

Claude Sonnet 5 is Anthropic's most agentic Sonnet model, released June 30, 2026, with performance close to Opus 4.8 at a lower price. On GPTProto the Sonnet 5 API runs from $1.6 / $8 per 1M tokens — roughly 20% below Anthropic's own rate — billed from a single balance shared across every model on the platform.

The cheap Claude-Fable-5 API offers Mythos-level intelligence for your hardest projects. It excels at autonomous coding, multi-day reasoning, and complex vision tasks, all while maintaining high safety standards and token efficiency.

Claude Opus 4.8 Thinking is Anthropic's most advanced model, featuring deep reasoning blocks for complex logic. Use Claude for high-accuracy coding, agentic workflows, and 200k context tasks via our high-performance API at GPTProto.com.

Claude Opus 4.8 offers top-tier reasoning and long-context handling. Use Claude for deep research or complex coding tasks. Opus 4.8 integrates via our unified API for reliable performance and easy scaling across diverse AI applications.

Claude Opus 4.7 represents a massive leap in AI agent capabilities, specifically in complex engineering and visual analysis. It introduces the xhigh reasoning intensity, bridging the gap between high-speed responses and deep thought. With a 3x increase in production task resolution on SWE-bench and 2576px vision support, Claude Opus 4.7 isn't just a chatbot; it's a fully functional agent that verifies its own results. Use Claude Opus 4.7 on GPTProto.com to enjoy stable API access, competitive pricing at $5/$25 per million tokens, and a seamless integration experience without the hassle of credit expiration.

Claude Opus 4.7 represents a massive leap in autonomous AI capabilities, specifically engineered to handle longer, more complex tasks with minimal human supervision. This update introduces the revolutionary xhigh thinking level and the Ultra Review command for developers using Claude Code. With enhanced vision that supports images up to 2,576 pixels and a new self-verification logic, Claude Opus 4.7 ensures higher accuracy in technical reporting and coding. On GPTProto, you can integrate this powerful API immediately using our flexible billing system, benefiting from the same competitive pricing as previous versions while accessing superior reasoning power.

The claude api represents a significant leap in large language model technology, offering unparalleled reasoning, safety, and a massive context window for complex data processing. By leveraging the claude api through GPTProto, developers and enterprises can deploy sophisticated ai solutions that handle intricate instructions with precision. Whether you are building an automated customer support system, a legal document analyzer, or a creative writing assistant, the claude api provides the necessary reliability and nuance. GPTProto ensures seamless integration with the claude api, providing a robust api infrastructure that minimizes downtime and optimizes performance for all your generative ai projects.

The claude sonnet model represents a critical milestone in the evolution of artificial intelligence, offering a sophisticated balance between cognitive depth and operational velocity. Designed by Anthropic and hosted on GPTProto, claude sonnet is engineered for enterprise-grade tasks that require nuanced reasoning without the latency of larger models. By utilizing the claude sonnet api, developers can access a model that excels in coding, multilingual translation, and complex data extraction. With GPTProto, you can leverage claude sonnet via a streamlined ai infrastructure, ensuring your applications remain responsive and highly capable in a competitive landscape.

Claude Sonnet 4.6 Thinking represents a major leap in reasoning-focused AI models, outperforming many larger models like Opus in instruction following and logical depth. While standard models might rush to an answer, Claude Sonnet 4.6 Thinking spends more internal cycles refining its logic, making it ideal for coding, complex data extraction, and creative tasks that require a specific tone. With GPTProto, you can bypass restrictive subscription tiers and access this model via a unified API. Our platform ensures that Claude Sonnet 4.6 Thinking remains stable and accessible for production-level deployments without worrying about credit resets or usage caps.

The claude-opus-4-6/text-to-text model represents the pinnacle of Anthropic's reasoning capabilities, now accessible via the high-performance GPT Proto platform. Designed for tasks that demand extreme precision, deep contextual understanding, and sophisticated creative writing, claude-opus-4-6/text-to-text excels where other models falter. Whether you are navigating complex legal documents, architecting large-scale software systems, or generating nuanced brand narratives, claude-opus-4-6/text-to-text provides the reliability and intelligence required for professional-grade output. By integrating this model through GPT Proto, users benefit from unified billing and a stable environment tailored for intensive AI workflows.

claude-opus-4-5-20251101 is an advanced AI language model from Anthropic’s Claude family. Designed for rapid, high-quality text generation and code, it supports broad use cases from content creation to complex analysis. Compared to previous Claude models, it brings improved reasoning, greater reliability, and more control over context windows and task-specific outputs. Professionals choose claude-opus-4-5-20251101 for its balance of speed, creativity, and precision across enterprise, research, and general productivity applications.

Integrate the claude haiku 4.5 api for high-speed, cost-efficient intelligence. With sub-200ms latency and native multimodal support, it is the definitive choice for agentic loops and massive data extraction on GPTProto.com.

claude-sonnet-4-5-20250929-thinking/text-to-text is a versatile AI language model from Anthropic, designed for high-quality text understanding and generation. It supports advanced reasoning, creative writing, and code assistance at high speed. Compared to legacy Claude models, it improves context handling, reasoning capability, and accuracy for professional workflows. Its reliability and focused text-to-text processing make it a robust choice for developers, data analysts, and content creators seeking safe, ethical AI assistance.

Claude Sonnet 4.5 API provides frontier intelligence at scale. This claude model offers a 200k context window, 92.4% HumanEval score, and reliable tool calling, making it the premier choice for developers using the sonnet 4.5 api via GPTProto.

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.

The Claude Opus 4.1 API delivers Anthropic’s peak cognitive performance. With a 200k context window and Computer Use 2.0, this 4.1 model excels at multi-step reasoning, complex coding, and nuanced document analysis for high-stakes enterprise agents.

Claude Sonnet 4-Thinking represents a significant shift in how AI handles complex logic and creative prose. Known for its 'thinking' phase, this model excels in deep reasoning tasks where other LLMs might rush to a conclusion. At GPTProto.com, we provide direct API access to Claude Sonnet 4-Thinking without the hassle of monthly subscriptions. Our platform offers a transparent pay-as-you-go model, ensuring you only pay for what you use. Whether you are refactoring enterprise-level code or drafting nuanced technical reports, Claude Sonnet 4-Thinking delivers precision, though users should watch for its characteristic punctuation style. Integrate it today to see why top devs prefer its quiet competence.

Claude Sonnet 4 API offers 1M token context and advanced reasoning. While it excels at coding and context management, users note its concise style and penchant for em-dashes. Perfect for technical tasks needing Opus-level depth and speed.