Introducing Claude Opus 5
2 hours ago
- Anthropic launched Claude Opus 5, described as thoughtful and proactive, offering frontier intelligence close to Claude Fable 5 at half the price.
- Opus 5 leads the Artificial Analysis leaderboard, is priced the same as Opus 4.8, and offers a 'fast mode' at double the cost.
- In a test, Opus 5 proactively wrote a computer vision pipeline to reconstruct a 3D FreeCAD model from raw pixels when unable to view a drawing directly.
- Opus 5 improved at finding cybersecurity vulnerabilities due to general capability gains, but was intentionally not trained on exploitation, distinguishing it from Mythos 5.
- Anthropic published a prompting guide for Claude Opus 5, and Thariq Shihipar wrote on context engineering for Claude 5 models.
- The author mentioned kayaking with sea otters and noted a pelican model issue with missing bicycle wheels.