Claude 3.5 Sonnet
by Anthropic, PBC
Retired Anthropic model; migrate to Sonnet 4.6/5.
Score
Score
Our verdict
Claude 3.5 Sonnet is retired. Treat it as a migration target: map prompts, evaluate tool-call behaviors, and move to Sonnet 4.6/5.
Overview
Score breakdown
Overall score
Scores are editorial assessments by the Compare Best AI team on a 0–10 scale.
Expert review
CBAI Editorial Team
Compare Best AI · Editorial Team
As of August 24, 2026, Claude 3.5 Sonnet is a legacy model: Anthropic retired it on October 28, 2025 and directs developers to Claude Sonnet 4.6 or the newer Sonnet 5. If you still reference 3.5 Sonnet in code, you should plan a cutover.
How we tested
Tasks evaluated
- ·Verified current model status and retirement date in Anthropic docs.
- ·Checked current Claude pricing page for live plan/API details and compliance mentions.
- ·Reviewed Anthropic 3.5 Sonnet launch post for historical price, context, and availability.
- ·Validated vision capabilities via the official model card addendum.
- ·Confirmed tool-use/function-calling documentation in current platform docs.
Method
Source verification from official Anthropic/Claude documentation, pricing, and research pages; no hands-on benchmarking performed.
Reviewer
CBAI Editorial Team
Plans & pricing
Not sold (retired Oct 28, 2025)
Pricing may vary by region. Always verify on the vendor's website.
Feature comparison
- 200K-token context window at launch.
- Multimodal vision understanding (documents, charts, diagrams) with strong benchmark performance.
- Tool use/function calling via JSON-schema-based APIs (legacy support on 3.x generation; migrate to current Sonnet models).
Is it right for you?
Good fit for
Migration planning
Teams moving legacy 3.5 Sonnet agents/prompts to Sonnet 4.6/5.
Compliance review
Auditors needing a verified record of 3.5 Sonnet’s historical capabilities.
Less suited for
New builds
Start with Sonnet 4.6/5; 3.5 Sonnet is retired and not sold.
User reviews
Editorial score
Distribution is estimated from our editorial score. Verified user reviews coming soon.
Use cases
Typical ways teams rely on this tool — from everyday tasks to specialized workflows.
- Legacy document/diagram Q&A (vision) migration planning.
- Refactoring code-gen pipelines off 3.5 Sonnet to Sonnet 4.6/5.
- Archival reproduction of 3.5 outputs for compliance sign-off.
Privacy & compliance
Security & data practices
Highlights we track from the vendor's documentation. Always confirm current terms, subprocessors, and regional policies on their official site.
- Anthropic states that for commercial offerings (e.g., Anthropic API, Claude for Work) customer inputs/outputs are not used to train models by default
- Enterprise plans include custom data retention controls and a HIPAA‑ready option
- Anthropic has SOC 2 Type II.
Details
Category
Price
- Not sold (retired Oct 28, 2025)
Free version
Best for
Organizations deprecating 3.5 Sonnet to Sonnet 4.6/5 who need verified guidance on status, capabilities, and replacements.
Frequently asked questions
Claude 3.5 Sonnet
Developer
Ready to get started?
Visit the Claude 3.5 Sonnet website to explore plans and pricing.
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