Home

Anthropic

Claude Opus 5 and Opus 5 Fast: Which One Should Builders Use?

Claude Opus 5 and Opus 5 Fast: Which One Should Builders Use?

Anthropic’s Claude Opus 5 (July 24, 2026) brings near–Fable 5 capability at Opus pricing, plus a ~2.5× Fast tier. How to choose anthropic/claude-opus-5 vs anthropic/claude-opus-5-fast.

Claude Opus 4.8: The Production Default Before You Reach for Fable 5

Claude Opus 4.8: The Production Default Before You Reach for Fable 5

Anthropic's flagship Opus 4.8 ships 1M context by default at $5/$25, with adaptive thinking and strong agentic coding scores. A builder's guide to specs, migration, effort tuning, and when to escalate to Fable 5.

Claude Fable 5: What Anthropic's Most Capable Model Means for Builders

Claude Fable 5: What Anthropic's Most Capable Model Means for Builders

Anthropic's most capable public model is available worldwide again. Here is what Claude Fable 5 costs, the new effort and refusal behaviors to design around, and how to adopt it pragmatically.