Models & Labs
Anthropic Releases Claude Opus 5.5 Model
AI Explainedhigh confidence
Why it matters
- →Represents a significant leap in frontier model capabilities
- →Provides new data points for measuring AI development speed
- →Intensifies competition among top AI labs
Anthropic has released Claude Opus 5.5, pushing the boundaries of current AI capabilities. The release is accompanied by a comprehensive 230-page paper and a system card detailing performance metrics. This launch highlights the accelerating pace of model development within frontier labs, prompting discussions on recursive self-improvement and automated AI research.
Read originalThe story around this
Earlier coverage that leads up to this article, and what followed. Lines connect each piece to the closest one after it, converging here.
How we got here
- 1Anthropic Releases Claude Opus 4.8
Anthropic · May 28, 2026 · Same story
- 2Claude Opus 4.8 Released by Anthropic
Matt Wolfe · May 29, 2026 · Same story
- 3Anthropic Releases Claude Opus 4.8 AI Model
AI Explained · May 29, 2026 · Same story
- 4Anthropic Releases Claude Fable 5 and Mythos 5
Skill Leap AI · June 9, 2026 · Same story
- 5Anthropic Launches Claude Opus 5 Model
Anthropic · July 24, 2026 · Same story
- 6Anthropic Launches Claude Opus 5 Model
The Rundown AI · July 27, 2026 · Same story
- 7Anthropic's Opus 5 Model Surpasses Expectations
The Rundown AI · July 27, 2026 · Same story
- 8Anthropic Releases Claude Opus 5
Matt Wolfe · July 31, 2026 · Same story
What happened next
- 9Anthropic Releases Claude Haiku 5.5 for Cost Efficiency
The AI Daily Brief · October 9, 2026 · Same story
- 10Anthropic Releases Claude Opus 5.5 System Card
AI Explained · October 12, 2026 · Same story
- 11Anthropic ships Claude 3.5 updates and new apps
Duncan Rogoff · October 21, 2026 · Same story
- 12Anthropic launches Claude Duet AI agent
The Verge AI · October 21, 2026 · Same story
- 13Anthropic Launches Claude Duet
The AI Daily Brief · October 23, 2026 · Related
Follow this story
Open the full story →Anthropic releases Claude Opus 5.5 with tighter security
10 developments
- Sep 22 · The Verge AI
Anthropic releases Claude Opus 5.5 with tighter security - Sep 22 · TechCrunch AI
Anthropic releases Opus 5.5 with lower prices↳ Opus 5.5 lowers output costs to $20 per million tokens while maintaining performance that beats the larger Fable model in coding and knowled - Sep 22 · GitHub Changelog
Claude Opus 5.5 arrives in GitHub Copilot↳ Claude Opus 5.5 is now available in GitHub Copilot for enterprise developers. - Sep 23 · Matthew Berman
Anthropic releases Opus 5.5 - Sep 23 · Duncan Rogoff
Anthropic releases official Claude Code playbook for Opus 5.5↳ Anthropic released an official guide optimizing Claude Code with Opus 5.5 to reduce latency and cost through specific prompting habits. - Sep 24 · AI Explained
Anthropic Releases Claude Opus 5.5 Model (This article) - Sep 25 · Lev Selector
Claude Opus 5.5 and GPT-6 Sol Released↳ OpenAI launches GPT-6 Sol and Luna variants alongside Anthropic's release. - Sep 26 · Matt Wolfe
Anthropic Releases Claude Opus 5.5 - Sep 30 · Matt Wolfe
Anthropic Releases Opus 5.5 Coding Model - Oct 2 · Lev Selector
Anthropic Launches Claude Sonnet 5.5 and Opus 5.5
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