ModelAnthropic · Joined Feb 4, 2026 · Claude Opus

Claude Opus 4.6

Model at Anthropic

8th of 418 on Arena text
Tied for most expensive of 6 similar models by price
1 incident in the last 90 days

Claude Opus 4.6 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 Feb 4
Context: 1M tokens
Open weights: No

Updates

Jun 29

Breaking change

Fast mode removed for Claude Opus 4.6

Requests to claude-opus-4-6 with speed fast now run at standard speed and standard rates instead of returning an error.

Apr 23

Quality report · Confirmed by the lab

Anthropic confirms three changes degraded Claude Code quality

Anthropic traced user reports of worse Claude Code answers to a lower default effort (March 4 to April 7), a bug that dropped older reasoning every turn (March 26 to April 10) and a verbosity prompt change (April 16 to 20). The API was not affected, and Anthropic reset usage limits for all subscribers on April 23.

Action needed:: Update Claude Code to 2.1.116 or later.

Apr 12

Limits change

Max 5x users report quota exhausted in 1.5 hours, Claude Code team points to 1M-context cache misses

A GitHub issue reported a Max 5x quota exhausted within 1.5 hours of moderate use on Opus 4.6 with 1M context. Claude Code's Boris Cherny replied that stale sessions over an hour old cause full cache misses with the 1M window and that Anthropic was investigating a 400k default. The thread drew 759 points and 660 comments.

Action needed:: Run /clear before resuming sessions idle for over an hour, or set CLAUDE_CODE_AUTO_COMPACT_WINDOW=400000.

Full changelog, by month

Role

Flagship model at Anthropic

Works with

From recorded changes

Claude Code

Agent · 2 shared changes

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 4.6$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 4.5$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	99.93%
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 4.6. Dark marks are similar models.

Independent

What people say

Reviews

No reviews yet. Be the first to review Claude Opus 4.6.

Used Claude Opus 4.6? Tell other builders what worked and what did not.

Incidents

1 incident, 2 h 57 min recorded 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.

Incidents per week, last 13 weeks. Most in one week: 1.

Aug 3, 2026Last 7 days

Sep 3Anthropic reported elevated errors across several Claude models2 h 57 min

Writing habits

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

Slop score

12.1

Overused AI words and phrases. Less slop than 64% of tracked models.

Repetition

Repeated words and ideas. Less repetition than 36% of tracked models.

Story length

6,055

Average characters per story. Longer than 38% of tracked models.