Models & Labs
Anthropic releases Opus 5.5
Matthew Bermanmedium confidence
Why it matters
- →Opus 5.5 represents the latest baseline for Anthropic's high-end reasoning capabilities.
- →Independent testing is already underway, suggesting rapid community adoption.
- →The release maintains competitive pressure on other top-tier models like GPT-4o and Gemini.
Anthropic has released Opus 5.5, an update to its Claude Opus family of models. The company provided limited technical details in the initial announcement, directing users to forwardfuture.com for independent testing results. This release follows a pattern of iterative improvements to the model's reasoning and coding capabilities. No specific performance metrics or pricing changes were disclosed in the primary source text.
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 Opus 4.8 with Dynamic Workflow
TechCrunch AI · May 28, 2026 · Same story
- 2Anthropic Releases Opus 4.8 Update
Matthew Berman · May 29, 2026 · Same story
- 3Anthropic Launches Claude Opus 5 Model
Anthropic · July 24, 2026 · Same story
- 4Anthropic Launches Opus 5 Model
TechCrunch AI · July 24, 2026 · Same story
- 5Anthropic Launches Claude Opus 5 Model
The Rundown AI · July 27, 2026 · Same story
- 6Anthropic's Opus 5 Model Surpasses Expectations
The Rundown AI · July 27, 2026 · Same story
- 7Anthropic's Opus 5 Release Raises Concerns for Indie Hackers
Fireship · July 29, 2026 · Same story
- 8Anthropic Releases Claude Opus 5
Matt Wolfe · July 31, 2026 · Same story
What happened next
- 9Claude Sonnet 5.5 arrives in GitHub Copilot
GitHub Changelog · September 28, 2026 · Related
- 10Claude Code v2.1.284 adds Sonnet 5.5
Claude Code Releases · September 30, 2026 · Related
Follow this story
Open the full story →Anthropic releases Claude Opus 5.5 with tighter security
9 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 (This article) - 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
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