Claude Opus

Model family at Anthropic · 8 models

Every version, including new ones

Models

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Claude Opus 5.5
Model · Claude Opus family
Limits change: Perplexity Agent API xhigh effort raises max steps from 100 to 300 · 3d
Claude Opus 5
Model · Claude Opus family
Benchmark: Arena text leaderboard: Gemini 4 Argon first, Opus 5.5 second, GPT-6 Astra 73rd · 1w
Claude Opus 4.8
Model · Claude Opus family
Retiring: Claude Opus 4.8 fast mode is deprecated and ends November 30, 2026 · 2d
Claude Opus 4.7
Model · Claude Opus family
GitHub: Copilot removes Claude Opus 4.7, Kimi K2.7 Code, Gemini 3.5 Flash and 3.6 Flash · Oct 2, 2026
Claude Opus 4.6
Model · Claude Opus family
Breaking change: Fast mode removed for Claude Opus 4.6 · Jun 29, 2026
Claude Opus 4.5
Model · Claude Opus family
Claude Opus 4Retired Jun 15, 2026
Model · Claude Opus family
Retired: Claude Sonnet 4 and Claude Opus 4 retired · Jun 15, 2026
Claude Opus 4.1Retired Aug 5, 2026
Model · Claude Opus family
Retired: Claude Opus 4.1 retired · Aug 5, 2026

Updates

Claude Opus 4.8

Model at Anthropic

Retiring2d

Claude Opus 4.8 fast mode is deprecated and ends November 30, 2026

Fast mode for Claude Opus 4.8 is deprecated and will be removed on November 30, 2026. After removal, requests with speed set to fast will return an error.

Takes effect Nov 30, 2026 · in 29 days

Action needed:: Migrate fast mode requests to Claude Opus 5.5 before November 30, 2026.

Perplexity Agent API and Claude Opus 5.5

2 products from Perplexity AI and Anthropic

Limits change3d

Perplexity Agent API xhigh effort raises max steps from 100 to 300

The xhigh level stays on Claude Opus 5.5 with GPT-6.1 Sol as fallback. Context compaction starts at 150,000 tokens, and it no longer sends a system prompt.

Before

100 max steps

After

300 max steps

Claude API, Fable 5.1, Opus 5.5

5 products from Anthropic

Now available1w

Full Claude Platform available on Google Cloud (Anthropic managed)

Claude Models on Google Cloud (Anthropic managed) is generally available with US and Global endpoints. It gives Google Cloud customers the full Claude Platform feature set with Google Cloud IAM, billing and commitment drawdown. Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5 are available, and fast mode for Opus 5.5 costs $8 / $40 per million input and output tokens there.

Claude Sonnet 5.5, Opus 5.5, Gemini 4 Argon

5 models from Anthropic and Google and OpenAI

Benchmark1w

Vals Index: Sonnet 5.5 edges Opus 5.5 and Gemini 4 Argon

Vals AI's GDP-weighted index of finance, coding, legal and tax tasks ranks Claude Sonnet 5.5 first at 70.85%, Opus 5.5 at 70.18%, Gemini 4 Argon 69.24%, GPT-6 Astra 65.02% and GPT-6.1 Sol 63.94% as of October 21, 2026.

Gemini 4 Argon, Claude Opus 5.5, Claude Opus 5

6 models from Google and Anthropic and OpenAI

Benchmark1w

Arena text leaderboard: Gemini 4 Argon first, Opus 5.5 second, GPT-6 Astra 73rd

Arena's October 20, 2026 text leaderboard ranks Gemini 4 Argon (High) first at 1532 (4,900 votes), Claude Opus 5.5 (High) second at 1516, Claude Opus 5 (Max) fourth at 1509, Claude Sonnet 5.5 (xHigh) 28th at 1473, GPT-6.1 Sol (Max) 66th at 1443 and GPT-6 Astra (Max) 73rd at 1441.

Claude Opus 5.5

Model at Anthropic

Quality report · Measured1w

Livenerf finds no change in Opus 5.5 accuracy in its first 10-day window

Window 1 (days 11 to 20, from October 4) scored 0.592 against a 0.584 launch-week baseline, a difference of +0.007 plus or minus 0.018 over 780 samples, which the pre-registered rule calls no change. Median output rose from 588 to 606 tokens. Day 19 ran on API credits because the Max weekly meter was exhausted.

Claude Opus 5.5, GPT-6 Astra, Sonnet 5.5

6 models from Anthropic and OpenAI and Google

Benchmark1w

Arena WebDev leaderboard: Opus 5.5 first, GPT-6 Astra second

Claude Opus 5.5, Sonnet 5.5, GPT-6 Astra

6 models from Anthropic and OpenAI and Google

Benchmark1w