Will the next Claude Opus model be released by September 27, 2026?

ResolutionResolved YES

YES payout100¢

NO payout0¢

VenuePolymarket

Conviction at publication

Realized · held to resolution+19%$100 paper stake

Polymarket

Sep 20 forecast

With an Opus 5.5 build already circulating and a history of quiet releases, a new Opus model by September 27 is highly likely.

A previously unreleased Opus build was served to a portion of Anthropic's traffic in mid-September, indicating active testing of a model update. A subsequent report on September 20 claims a new Opus 5.5 checkpoint with a possible release as early as September 22. While Anthropic has issued no official announcement and continues publicly emphasizing safety evaluation, the company has previously released Opus iterations without launch events. Markets currently treat this outcome as somewhat uncertain, likely reflecting the lack of an official announcement and safety-focused rhetoric, but the circulating build and competitive dynamics strongly favor a release before the deadline.

Points to YES

An unreleased Opus 5.2 build was served to a portion of traffic under the Opus 5 label in mid-September, demonstrating active testing.
An unreleased Opus build with metadata pointing to claude-opus-5.2 was served to a portion of traffic in mid-September, briefly cut on September 17, and resumed about a day later.
A report claims a new Opus 5.5 checkpoint exists with a rumored release as early as September 22.
A report circulated on September 20 claiming a new checkpoint for Claude Opus 5.5 under internal codename claude-wafer-eap with a rumored release as early as Tuesday, September 22.
Anthropic has previously released Opus updates without launch events, showing a pattern of quiet iterative releases.
Anthropic released Opus 4.8 on May 28 and Opus 5 on July 24 without launch events, often skipping intermediate version numbers.

Points to NO

No official announcement or public model identifier exists for any new Opus model as of September 20.
As of September 20, no model card, API identifier, price sheet, benchmark, or official statement exists for the rumored Claude Opus 5.5 checkpoint.
Anthropic is publicly emphasizing safety evaluation for its next AI model, which could slow a release.
Anthropic is evaluating the safety of its next AI model as part of deliberations over whether to release it.

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