Claude Opus 5.5 reportedly in stealth testing
TestingCatalog cited rumors of a launch the week of September 21. A separate account said Polymarket odds for Anthropic’s next Opus release on September 21 had jumped to 88%.
TLDR
A September 20 post claimed Anthropic was testing Opus 5.5 under the codename “claude-wafer-eap,” with a release planned for September 22. Quoting that post on September 21, TestingCatalog described a possible launch that week as a rumor. Speculation also pointed to an earlier date: a separate account said Polymarket odds for Anthropic to release its next Opus model on September 21 had jumped to 88%.
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