Verified65% confidenceReleaseExact time
Anthropic released Opus 5.5 at the same point in time.
3
Sources
65%
Confidence
Medium-term (~90 days)
Relevance
9/30/2026
First Seen
Valid until: 12/29/2026
Sources
Related Entities
Related Claims
UnverifiedAnthropic released Claude Opus 5.5 on almost the same day as OpenAI's release.76% similarUnverifiedAnthropic released the Opus 5.5 model along with an accompanying prompting guide.76% similarUnverifiedAnthropic launched the Opus 5.5 model through Claude Code.75% similarUnverifiedAnthropic made a similar model split the same month: Haiku 5.5 targeting high-throughput scenarios and Opus 5.5 targeting frontier reasoning.72% similarUnverifiedAnthropic's Claude upgrades, with Fable 5.1 and MyFast 5.1 launching simultaneously67% similar
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