Explore the CometAPI model catalog

Explore the Claude Haiku 5.5 API.

Explore the Claude Fable 5.5 API.

Claude Sonnet 5.5 is Anthropic's September 2026 Sonnet release and the second model in the Claude 5.5 family.

Fastest, most cost-effective model.

Claude Opus 4.7 is a hybrid reasoning model designed specifically for frontier-level coding, AI agents, and complex multi-step professional work. Unlike lighter models (e.g., Sonnet or Haiku variants), Opus 4.7 prioritizes depth, consistency, and autonomy on the hardest tasks.

Claude Opus 4.8 is a premium AI model designed for advanced reasoning, deep analysis, and high-quality content generation. It excels at handling complex instructions, long-context understanding, and sophisticated problem-solving across professional and technical domains.

Claude Sonnet 5 API is live on CometAPI at $1.6 per million input tokens and $8 per million output tokens, 20 percent below Anthropic list price. One key gives you Claude Sonnet 5 plus 500+ models from OpenAI, Google, and ByteDance under all in one pricing and a single invoice. No seat fees. No monthly minimum. Pay only for what you use. Start free and make your first call in under five minutes.

Claude Opus 5 is available today. It’s a thoughtful and proactive model that comes close to the frontier intelligence of Claude Fable 5 at half the price.

Claude Opus 4.6 is Anthropic’s “Opus”-class large language model, released February 2026. It is positioned as a workhorse for knowledge-work and research workflows — improving long-context reasoning, multi-step planning, tool use (including agentic software workflows), and computer-use tasks such as automated slide and spreadsheet generation.

Claude Opus 5.5 released September 22, 2026, and designed for long-running agentic coding and knowledge work.

Access to Claude Fable 5 has been restored. It brings 5th-generation intelligence to your most ambitious coding and professional work.

Claude Sonnet 4.6 is our most capable Sonnet model yet. It’s a full upgrade of the model’s skills across coding, computer use, long-context reasoning, agent planning, knowledge work, and design.

Anthropic's most capable, widely released model, for the most demanding reasoning and long-horizon agentic work

claude-fable-5-1 Next generation intelligence for long-running agents

Claude Mythos Preview is our most capable frontier model to date, and shows a striking leap in scores on many evaluation benchmarks compared to our previous frontier model, Claude Opus 4.6.

Claude Opus 5.2 may be undergoing limited testing in Claude Code. Here is what the leaks claim, what remains unverified, and how CometAPI access would work after release.

Claude Opus 4.5 is an instruction-tuned large language model from Anthropic designed for complex reasoning, coding, and multi-turn dialogue. It supports extended context handling, tool/function calling, structured outputs, and integration with retrieval-augmented workflows. Typical uses include analytical assistants, code generation and review, knowledge-base QA, and content drafting with policy-aligned responses. Technical highlights include instruction following, RAG-friendly behavior, and safety controls available in Claude deployments.

Claude Sonnet 4.5 achieves a significant leap in computer application capabilities. On OSWorld, a benchmark platform for testing AI models on real-world computer tasks, Sonnet 4.5 jumped to the top with 61.4%, whereas just four months prior, Sonnet 4 led with 42.2%. Our Claude for Chrome extension puts these upgraded features into practice.

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