Claude Sonnet 4

Anthropic's balanced frontier family for production chat, coding, and agent workflows.

Capabilities

Modalities: textimage→text
Capabilities: reasoningimageInputbatchSupportpromptCachingfunctionCallingstructuredOutputs
Strengths: Strong coding and agent planning, Large context window, Stable prompt-caching economics
Tradeoffs: Higher output cost than flash-tier families, No first-party web search surface

Official Links

Intro

Docs

Pricing

Release note

Benchmark	Version	Score	Date	Source	Notes
SWE-bench Verified	2026-Q1	64.2 pass@1	Feb 10, 2026	Anthropic release notes	Provider-published benchmark evidence.

Release	Alias	Lifecycle	Release Date	Deprecation	Shutdown	Summary
Claude Sonnet 4	claude-sonnet-4	Active	May 22, 2025	—	—	Fourth-generation Sonnet family for production workloads.

Host	Type	Context	Pricing Note	Differences
Anthropic API	first-party	200.0K	Reference pricing and full prompt-caching semantics.	Prompt caching; Native batch processing
AWS Bedrock	cloud	200.0K	Regional availability and quotas can differ from first-party Anthropic access.	AWS IAM integration; Separate billing

Migration Guidance

Best default Anthropic family when Opus is too expensive and Haiku is too small for the workload.

Replacement models: claude-opus-4

Breaking changes: Tool-use latency and output depth differ from Opus-tier workloads.

Change Events

Date	Type	Title	Description	Source
May 22, 2025	family_added	Family launched	Claude Sonnet 4 became Anthropic's default balanced frontier family.	Anthropic API release notes