ModelRefs / Claude 3.5 Sonnet - AI model implementation reference

Claude 3.5 Sonnet - AI model implementation reference

Claude 3.5 Sonnet is a retired Anthropic model from the Claude 3.5 generation, positioned in its time for coding, reasoning, and vision-enabled workflows at a mid-tier cost-latency profile. Anthropic's model deprecations page lists both snapshots, claude-3-5-sonnet-20240620 and claude-3-5-sonnet-20241022, as deprecated on 13 August 2025 and retired on 28 October 2025, with Claude Sonnet 5.5 as the recommended replacement. Those dates apply to Anthropic-operated platforms; Amazon Bedrock and Google Cloud set their own retirement schedules.

Overview

Claude 3.5 Sonnet is attributed to Anthropic in ModelRefs' canonical registry. Tracked modalities: Text input and output, Image input. Primary use cases considered on ModelRefs: Coding assistants and code-review workflows; Vision-enabled document and screenshot understanding with measured quality targets.

This ModelRefs profile is decision-support material, not a final or universal ranking. Confirm current behavior, access, pricing, limits, licensing, and lifecycle in Anthropic's own documentation, and evaluate Claude 3.5 Sonnet on representative workloads before implementation.

Lifecycle

Retired. No longer served. Requests to it fail rather than falling back.

Deprecated
13 August 2025
Stopped serving
28 October 2025
Provider's replacement
claude-sonnet-5-5
Applies to
Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry); Amazon Bedrock and Google Cloud set their own retirement schedules.

Provider-documented snapshots

  • claude-3-5-sonnet-20240620
  • claude-3-5-sonnet-20241022

Source: platform.claude.com, checked 2026-10-16.

Benchmark & Evaluation

ModelRefs currently has partial, narrow benchmark coverage for Claude 3.5 Sonnet. Treat the available benchmark evidence as one input to the decision, not a guarantee that Claude 3.5 Sonnet is the strongest option for your workload, and evaluate it on representative workloads before selecting it.

  • No benchmark score is imported into this editorial record. Canonical benchmark runs and scores are governed separately with their own provenance and render only through those records; coverage in ModelRefs is currently narrow (partial), so any scored comparison must show its coverage limits.
  • ModelRefs holds canonical run evidence on software-engineering evaluation (SWE-bench); coverage is narrow and provider-reported evaluations are not independently reproduced here.

Implementation considerations

  • Both dated snapshots are retired on Anthropic-operated platforms, so requests fail and migration to Claude Sonnet 5.5 or another current model is required.
  • Verify context-window and feature availability for your API tier and region rather than assuming parity across platforms.
  • Retired on Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry) since 28 October 2025; requests to a retired model ID fail rather than falling back.
  • Amazon Bedrock and Google Cloud publish their own model tables and retirement schedules, so availability there must be checked separately.
  • Feature flags, rate limits, and data-retention controls differ by platform and account; check the models overview for the current matrix.

Risks and limitations

  • Hosted-model behavior, quotas, pricing, and data controls can change without a client-side version pin unless a dated snapshot is used.
  • Provider-reported capabilities require task-specific evaluation before production reliance.

Source coverage

ModelRefs reviewed Anthropic's published material on 2026-07-12. Model behavior, access, pricing, limits, and lifecycle can change, so verify the linked provider documentation before implementation. What remains open is recorded on this page: Independent reproduction of provider-reported coding evaluations is not attached. Fit and comparison signals remain provisional until tested on your own workload.

Connected ModelRefs evidence

Sources

Continue your research

Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to Claude 3.5 Sonnet - AI model implementation reference.