Chat Models
Anthropic
Claude Fable 5
Best for Research
Flagship model for the hardest problems
ResearchComplex reasoning
Same provider
More from Anthropic
Anthropic
Claude Opus 5
Powerful model for complex work
Anthropic
Claude Sonnet 5
Balanced speed, cost, and intelligence
Anthropic
Claude Opus 4.1
Original Opus 4 flagship with strong reasoning
Anthropic
Claude Opus 4.8
Latest flagship Opus with state-of-the-art reasoning, expanded agentic tool use, and 1M context.