Breaking

Claude Opus 5.5 Rumor Circulates as Anthropic Weighs New Model Release

September 21, 2026 at 18:17 EDT

Foundation Models
AI Agents

An unverified claim that Anthropic will release Claude Opus 5.5 on Tuesday, September 22, 2026, has put fresh attention on the company’s next Claude update, but Anthropic’s public model pages still list Claude Opus 5 as the latest Opus model. As of Monday, September 21, 2026, the public record does not show a Claude Opus 5.5 announcement, model ID, pricing row or system card.

September 21, 2026 · Anthropic

Opus 5.5: claim, not record

A Tuesday release claim is circulating around a supposed Claude Opus 5.5 model. The checkable baseline remains Claude Opus 5, while a broader model-release decision is reportedly under discussion.

Sep 22

rumored Tuesday date

$5 / $25

listed Opus 5 input and output price per MTok

Opus 5 context window

128K

Opus 5 max output

The price claim is a 4-block column beside a 5-block baseline

Output price per million tokens, drawn with one block equal to $5.

$25Opus 5 listed

$20unverified claim

What would make it real

Announcement

A named public launch

→

Model ID

A callable Opus 5.5 string

→

System card

Safety and deployment details

Why builders care

A stronger Opus-class model could matter for long coding agents, enterprise workflows and high-volume usage if lower token pricing proves real.

Why caution is high

There is no public Opus 5.5 model ID, no pricing row, no system card and no reproducible benchmark yet.

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