Models & Labs
Anthropic Launches Claude Sonnet 5.5 and Opus 5.5
Lev Selectorhigh confidence
Why it matters
- →Reduces inference costs for enterprise applications
- →Improves quality for creative and writing workflows
- →Strengthens Anthropic's position in the competitive frontier model market
Anthropic has launched two new versions of its Claude models: Sonnet 5.5 and Opus 5.5. The Sonnet 5.5 update focuses on speed and cost reduction, offering lower costs per completed task while maintaining high performance. Simultaneously, the Opus 5.5 release enhances creative writing capabilities, positioning it as a superior tool for long-form content generation compared to previous iterations.
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 launches Claude Sonnet 5 for affordable AI agents
TechCrunch AI · June 30, 2026 · Same story
- 2Claude Sonnet 5 Released by Anthropic
AI Explained · July 2, 2026 · Same story
- 3Claude Sonnet 5 and Claude Fable 5 Return
Lev Selector · July 3, 2026 · Same story
- 4Anthropic Launches Claude Opus 5 Model
Anthropic · July 24, 2026 · Same story
- 5Anthropic Launches Claude Opus 5 Model
The Rundown AI · July 27, 2026 · Same story
- 6Anthropic Releases Claude Opus 5
Matt Wolfe · July 31, 2026 · Same story
- 7Anthropic Sonnet 5.5 narrows gap with Opus at half price
The Rundown AI · September 29, 2026 · Same story
- 8Anthropic Releases Claude Sonnet 5.5 and Code Mods
Matt Wolfe · October 2, 2026 · Same story
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 - 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 (This article)
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