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Claude 3.5 Sonnet

✓ Verified

Prior-generation Claude Sonnet model with 200K context for coding workflows

Updated Feb 27, 2026
AI ModelPay-per-useAPIWebiOS
Last reviewed: Feb 27, 2026Details verified against vendor changelogs and hands-on usage where possible.

About

Claude 3.5 Sonnet (launched Aug 28, 2025) is Anthropic's prior-generation mid-tier Sonnet model line. It was widely used for coding and vision tasks with a 200K context window and $3/$15 per million input/output token pricing. Anthropic's current Sonnet default is the 4.6 line, so verify active model availability and pricing on official pages before implementation planning. Claude Sonnet 3.5 remains a historical benchmark entry and is superseded in many workflows by newer Sonnet 4.6 releases.

Key Features

  • ✓200K token context window with text and image inputs
  • ✓Strong coding and multi-step reasoning performance
  • ✓Tool use/function calling and structured outputs
  • ✓Available via Anthropic API, Claude.ai, Claude iOS, Amazon Bedrock, and Google Vertex AI
  • ✓Artifacts workspace in Claude.ai for editing generated code and content

Pros & Cons

Pros

  • Supports multiple platforms (API, Web, iOS)
  • Broad integrations (5+ connectors)
  • Agentic mode for autonomous workflows

Cons

  • No free tier; paid plans only
  • No BYOK; model choice dictated by vendor

Use Cases

    Technical Details

    Languages

    Any (via API)

    AI Models

    claude-3-5-sonnet

    Integrations

    Anthropic API (Messages)Claude.aiClaude iOSAmazon BedrockGoogle Vertex AI

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    Frequently Asked Questions

    What is Claude 3.5 Sonnet?

    Claude 3.5 Sonnet (launched Aug 28, 2025) is Anthropic's prior-generation mid-tier Sonnet model line. It was widely used for coding and vision tasks with a 200K context window and $3/$15 per million input/output token pricing. Anthropic's current Sonnet default is the 4.6 line, so verify active model availability and pricing on official pages before implementation planning. Claude Sonnet 3.5 remains a historical benchmark entry and is superseded in many workflows by newer Sonnet 4.6 releases.

    How much does Claude 3.5 Sonnet cost?

    Claude 3.5 Sonnet offers pay-per-use pricing. Plans include: API on-demand: $3 per 1M input tokens; $15 per 1M output tokens.

    What programming languages does Claude 3.5 Sonnet support?

    Claude 3.5 Sonnet supports 1+ programming languages including Any (via API).

    What AI models does Claude 3.5 Sonnet use?

    Claude 3.5 Sonnet is powered by claude-3-5-sonnet.

    What platforms does Claude 3.5 Sonnet support?

    Claude 3.5 Sonnet is available on API, Web, iOS.

    What can Claude 3.5 Sonnet do?

    Claude 3.5 Sonnet provides code generation, AI chat, agentic/autonomous mode. Key features include: 200K token context window with text and image inputs, Strong coding and multi-step reasoning performance, Tool use/function calling and structured outputs.

    Visit Claude 3.5 Sonnet →

    Pricing and features change frequently—confirm on the vendor site.

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    Pricing

    API on-demand

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

    • Anthropic API access
    • Claude.ai and Claude iOS with higher limits on Pro and Team

    Company

    Name
    Anthropic
    Founded
    2021
    Location
    San Francisco, CA

    Links

    GitHub →Twitter →

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