Anthropic: Claude Opus 4.1

By Anthropic

Released: 2025-08-05

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Anthropic Claude Opus 4 1, developed by Anthropic, features 200k-token context window. Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains in multi-file code refactoring, debugging precision, and detail-oriented reasoning. The model supports extended thinking up to 64K tokens and is optimised for tasks involving research, data analysis, and tool-assisted reasoning. Premium pricing at $15.0/1M tokens reflects its advanced capabilities.

Visit Anthropic: Claude Opus 4.1

AI-Powered

Leverages advanced AI technology to deliver cutting-edge capabilities and results.

Fast & Efficient

Optimized performance ensures quick results without compromising on quality.

Purpose-Built

Specifically designed for llms tasks and workflows.

Anthropic Model Timeline

28 Sept 2026Claude Sonnet 5.5

1M tokens context

22 Sept 2026Claude Opus 5.5

1M tokens context

7 Aug 2026Claude Code

30 Jun 2026Claude Sonnet 5

1M tokens context

30 Jun 2026Claude Mythos 5

2 Jun 2026Anthropic Mythos 1

1 Jun 2026Claude Fable 5

1M tokens context

28 May 2026Claude Opus 4.8

Long-context context

13 Jan 2026Claude Cowork

24 Nov 2025Anthropic: Claude Opus 4.5

200k tokens context

15 Oct 2025Anthropic: Claude Haiku 4.5

200k tokens context

1 Oct 2025Claude 4.5 Haiku

200k tokens context

29 Sept 2025Anthropic: Claude Sonnet 4.5

1,000k tokens context

5 Aug 2025

Anthropic: Claude Opus 4.1Current

200k tokens context

22 May 2025Anthropic: Claude Opus 4

200k tokens context

22 May 2025Anthropic: Claude Sonnet 4

1,000k tokens context

24 Feb 2025Anthropic: Claude 3.7 Sonnet (thinking)

200k tokens context

24 Feb 2025Anthropic: Claude 3.7 Sonnet

200k tokens context

4 Nov 2024Anthropic: Claude 3.5 Haiku

200k tokens context

22 Oct 2024Anthropic: Claude 3.5 Sonnet

200k tokens context

13 Mar 2024Anthropic: Claude 3 Haiku

200k tokens context

Specifications

pricing$15.00 / $75.00 (per 1M)

context Window200k tokens

AI Evaluation

4.8

Expert Rating

Text4.9/5

Coding4.8/5

Combines language understanding with search capabilities. Excels at finding and synthesizing information from various sources.

Pros

200k token context window
Strong code generation and debugging
Advanced logical reasoning
Agent-ready with tool use

Cons

Higher cost tier
May lack creative flair

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Claude Opus 5.5

Claude Opus 5.5, launched 22 September 2026, is Anthropic's current Opus-line flagship, replacing Opus 5. It performs at roughly the level of Claude Fable 5.1 on most work while costing 40% less to run than Opus 5, at $4 input / $20 output per million tokens (both 20% down, cache reads cut 60% to $0.20). It leads on Terminal-Bench 4.0, GDPval-AA v2.1 and Humanity's Last Exam, and is the first Opus model to ship with Fable-5.1-class cybersecurity, biology and distillation safeguards.

Claude Sonnet 5.5

Claude Sonnet 5.5, released 28 September 2026, is the second model in Anthropic's Claude 5.5 family and the faster, lower-cost complement to Claude Opus 5.5. It keeps Sonnet 5's $2 input / $10 output per million tokens ($0.20 cache reads) while generating output over 30% faster, and scores 70.6% on Terminal-Bench 4.0, above Opus 5.5's 66.4%. It has a 1M-token context window, 128K max output, adaptive thinking, and is the first Sonnet with cyber and anti-distillation classifiers.