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Anthropic

Claude Sonnet 5

Anthropic's mid-tier model, now close enough to Opus on real work that it's the default choice for almost everything.

Quality

Modality

multimodal

Context

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Access

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Fabian's Take

"I've been running Sonnet 5 against Opus 4.8 on real tasks this week, and it's closer than any Sonnet generation has been before. It's become agentic in a way earlier Sonnets weren't — it strings together more tool calls, sticks with harder problems longer, and rarely needs me to step in and redirect it. For most Claude work, this is the model to reach for by default."

Claude Sonnet 5 is the latest version of Anthropic’s mid-tier model, and it closes most of the gap that used to separate Sonnet from Opus. It’s not just faster and cheaper anymore — it’s meaningfully better at working through multi-step tasks on its own.

How it compares

Against Opus 4.8, Sonnet 5 gives up a little depth on the hardest, most ambiguous reasoning problems, but for coding, drafting, and everyday agentic work the two are close enough that Sonnet 5 is the more sensible default. It’s also a clear step up from Sonnet 4.6 in how it handles tools: it uses more of them, in longer sequences, and holds up over longer stretches of autonomous work without drifting off track.