Claude Opus 5.5

By Anthropic

Released: 2026-09-22

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LLM

Agents

Coding

Reasoning

Anthropic

Paid

New

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.

Visit Claude Opus 5.5

Read our full in-depth review: Claude Opus 5.5: Benchmarks, Pricing & Safety Review

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

22 Sept 2026

Claude Opus 5.5Current

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 2025Anthropic: Claude Opus 4.1

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$4/$20 per 1M tokens (input/output)

context Window1M tokens

AI Evaluation

4.9

Expert Rating

Text4.9/5

Coding4.9/5

The new Opus-line default: near-Fable-5.1 capability at a 40% lower run cost than Opus 5, plus safeguards previously reserved for the Fable/Mythos line. The clearest all-round upgrade Anthropic has shipped in the Opus tier.

Pros

20-60% cheaper than Opus 5 across input, output and cache
Leads Terminal-Bench 4.0, GDPval-AA v2.1, Humanity's Last Exam
First Opus model with Fable-5.1-class safety classifiers

Cons

Trails GPT-6 Astra on AutomationBench and Terminal-Bench-Science
Sonnet 5.5 / Haiku 5.5 not yet shipped, so mid-tier stays on 5.0

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