ClosedAnthropic/10 trustVerified

Claude Sonnet 4

Name: Claude Sonnet 4
Rating: 9

Anthropic's workhorse frontier model: near-flagship capability at a mid-tier price

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About

Claude Sonnet 4 launched May 22, 2025 alongside Opus 4 as the practical default in Anthropic's lineup. It kept the 200K context window and $3/$15 pricing of its predecessors but pushed coding performance meaningfully forward, with team-reported SWE-bench numbers well above 3.7 Sonnet. It supports extended thinking, tool use, MCP connectors, and code execution, and it ships on every Claude plan including free. For most production workloads it is the sensible pick: Opus 4 exists for the hardest problems, but Sonnet 4 delivers most of the capability at a fifth of the price and noticeably higher speed.

Specs

Context window

200,000 tokens

Pricing

$3 per 1M input tokens, $15 per 1M output tokens

Free quota

Included on the free Claude plan

API access

Anthropic API, Amazon Bedrock, Google Vertex AI

Weights

Closed — API only

Released

May 22, 2025

Benchmarks

Team-reported: 72.7% SWE-bench Verified

Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.

Use cases

Production coding assistantsAgentic workflows at scaleDocument analysisGeneral-purpose chat products

Trust score — 9/10

/10 trustVerified

Scored 9/10 (verified tier, metrics-v1). Evidence: May 22, 2025 launch corroborated across 3 sources; Pricing $3/$15, 200K context, 64K max output consistent; SWE-bench 72.7% labeled team-reported; Free-plan inclusion verified; Opus 4 comparison kept factual.