Claude Sonnet 5

Frontier intelligence at scale for coding, agents and enterprise workflows.

Context1M

ModalityText · Image

AccessAPI · Cloud

ReasoningAdaptive

Where it fits.

The Sonnet line is positioned at the capability-efficiency intersection for tool-heavy production systems. Sonnet 5 is Anthropic's frontier-at-scale tier for coding, data analysis, content, vision and agentic tools. It combines a 1M context and 128K output with lower latency than the top tiers.

Core capabilities

1M context and 128K maximum output
Adaptive thinking with controllable effort
Strong coding, visual understanding and tool use
Managed availability across Claude API and cloud platforms

Best-fit workflows

Software engineering agents
Enterprise automation
Document and visual understanding

04 / OPERATIONS

From evaluation
to production.

Deployment notes

A practical primary model for software and enterprise agents. Keep tool schemas narrow, return thinking blocks unchanged, and remove model-specific thinking content when switching a conversation to another family.

Watch before choosing

Model IDs, context limits and regional support can differ across clouds; verify each deployment target. Adaptive thinking is on by default and differs from Haiku's manual extended-thinking API. Model switches inside an active conversation require careful handling of prior thinking blocks.

Family & versions

Claude Fable 5Widely released flagship
Claude Opus 5Complex agents
Claude Sonnet 5Frontier at scale
Claude Haiku 4.5Fast

Specifications and positioning checked against provider documentation.