Claude Sonnet 4
LegacyPremiumSignificantly enhanced over Sonnet 3.7 in coding and reasoning tasks.
State-of-the-art coding with improved precision and controllability. Predecessor to Claude Sonnet 4.5.
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Claude Sonnet 4 by Anthropic has a Capability Index of 74.7, making it comparable to the field average. It ranks #43 out of 92 models on the idapt capability leaderboard. Claude Sonnet 4 is very affordable at $3.00/M tokens input and $15.00/M tokens output. Cached input reads are priced at $0.30/M tokens, making repeated context cheaper. The model supports vision/image input, extended reasoning, a 200K context window.
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Mistral Small 4vs Claude Sonnet 4Frequently Asked Questions about Claude Sonnet 4▼
When was Claude Sonnet 4 released?
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Claude Sonnet 4 was released on May 22, 2025.
Who created Claude Sonnet 4?
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Claude Sonnet 4 was created by Anthropic.
How capable is Claude Sonnet 4?
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Claude Sonnet 4 has a Capability Index of 74.7/100, making it comparable to the field average. It ranks #43 out of 92 models.
How much does Claude Sonnet 4 cost?
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Claude Sonnet 4 costs $3.00/M input tokens and $15.00/M output tokens.
What is Claude Sonnet 4 API pricing?
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The Claude Sonnet 4 API is priced at $3.00 per million input tokens and $15.00 per million output tokens. You can access Claude Sonnet 4 through idapt.app alongside 200+ other AI models in one workspace.
Is Claude Sonnet 4 a reasoning model?
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Yes, Claude Sonnet 4 is a reasoning model. It can think step-by-step through complex problems before providing an answer, often yielding better results on difficult tasks like math, coding, and multi-step logic.
Does Claude Sonnet 4 support image or vision input?
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Yes, Claude Sonnet 4 supports vision/image input. You can share images in your conversation and the model will analyze and respond based on their content.
Does Claude Sonnet 4 support audio?
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No, Claude Sonnet 4 does not support audio input.
What is the context window of Claude Sonnet 4?
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Claude Sonnet 4 has a context window of 200K tokens, meaning it can process approximately 150,000 words of context at once.
Is Claude Sonnet 4 open source?
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Claude Sonnet 4 is a proprietary model developed by Anthropic. The model weights and training data are not publicly available.
What is Claude Sonnet 4 good at?
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Based on benchmark data, Claude Sonnet 4 excels at: visual analysis and image understanding. It is Anthropic's capable model suitable for a wide range of tasks.
Where can I use Claude Sonnet 4?
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You can chat with Claude Sonnet 4 on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access Claude Sonnet 4 through Anthropic's own API or platform.