ModelAnthropic · Joined Nov 24, 2025 · Claude Opus

Claude Opus 4.5

Model at Anthropic

48th of 418 on Arena text
Tied for most expensive of 6 similar models by price
0 incidents in the last 90 days

Claude Opus 4.5 does not have a researched profile yet. Everything here comes from its recorded changes and public listings, each linked to its source.

The basics

As of Nov 1

Status: Available
Price: $5 in, $25 outPer 1M tokens, since Nov 24
Context: 200K tokens
Open weights: No

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.

Full changelog, by month

Role

Flagship model at Anthropic

Similar models

Claude Opus 5.5

$4 in, $20 out

Claude Opus 5

$5 in, $25 out

Claude Opus 4.8

$5 in, $25 out

Similar models for now. Real viewing data comes after launch.

Cost vs peers

Tied for most expensive of 6 similar models by output price.

Claude Opus 5.5$20 out · $4 in
Claude Opus 4.5$25 out · $5 in
Claude Opus 5$25 out · $5 in
Claude Opus 4.8$25 out · $5 in
Claude Opus 4.7$25 out · $5 in
Claude Opus 4.6$25 out · $5 in

Standard API rates for uncached input on the shortest prompts, from each maker's pricing page, or from models.dev for models not researched here yet.

Where it works

Place	Type	Price per 1M tokens, in / out	Uptime
Claude Platform on AWS	API host	$5 / $25	100%
Azure	API host	$5 / $25	100%
Google	API host	$5 / $25	100%
Amazon Bedrock	API host	$5 / $25	100%
Anthropic	API host	$5 / $25	100%

Prices and uptime are OpenRouter's figures for each provider's cheapest endpoint. Uptime covers the last 24 hours.

Benchmarks

Higher is better. Green is Claude Opus 4.5. Dark marks are similar models.

Independent

What people say

Reviews

No reviews yet. Be the first to review Claude Opus 4.5.

Used Claude Opus 4.5? Tell other builders what worked and what did not.

Incidents

0 incidents in the last 90 days, from Anthropic's status page. Only major incidents or ones lasting 30 minutes or more are counted. Fewer records do not prove better uptime.

Jul 30Anthropic reported elevated errors across many Claude models4 h 51 min

Writing habits

Creative writing · EQ-Bench, among 51 models tracked here

Slop score

16.2

Overused AI words and phrases. Less slop than 44% of tracked models.

Repetition

4.3

Repeated words and ideas. Less repetition than 28% of tracked models.

Story length

6,124

Average characters per story. Longer than 44% of tracked models.