ModelRefs / Claude 3.7 Sonnet - AI model implementation reference

Claude 3.7 Sonnet - AI model implementation reference

Claude 3.7 Sonnet is a retired Anthropic model that introduced extended-thinking support and strengthened agentic coding in the Claude 3.7 line. Anthropic's model deprecations page lists claude-3-7-sonnet-20250219 as deprecated on 28 October 2025 and retired on 19 February 2026, 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 3.7 Sonnet is attributed to Anthropic in ModelRefs' canonical registry. Tracked modalities: Text input and output, Image input. Primary use cases considered on ModelRefs: Repository-scale coding assistants and agentic coding loops; Tool-heavy workflows where configurable extended thinking is useful.

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 3.7 Sonnet on representative workloads before implementation.

Lifecycle

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

Deprecated
28 October 2025
Stopped serving
19 February 2026
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-3-7-sonnet-20250219

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

Benchmark & Evaluation

ModelRefs currently has partial, narrow benchmark coverage for Claude 3.7 Sonnet. Treat the available benchmark evidence as one input to the decision, not a guarantee that Claude 3.7 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

  • Decide extended-thinking budgets explicitly; thinking tokens change cost and latency and should be tuned per task.
  • Requests to claude-3-7-sonnet-20250219 fail on Anthropic-operated platforms; extended-thinking workloads need re-tuning against a current model's thinking controls rather than porting unchanged.
  • Retired on Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry) since 19 February 2026; 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/agentic 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 3.7 Sonnet - AI model implementation reference.