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AnthropicClaude 4 familyRetiredReasoning modelReleased 22 May 2025

Claude Sonnet 4

Retired on Anthropic-operated platforms; requests to claude-sonnet-4-20250514 on the Claude API fail. Listed for reference because it may still be reachable via Bedrock, Google Cloud or OpenRouter.

Model idclaude-sonnet-4-20250514

Price$3 in, $15 out per 1M tokens

Checked29 September 2026

No published training cutoff

At least2,020events since its release on 22 May 2025

89 historic, 467 major. 540 days of news.

Anthropic doesn’t publish a training cutoff, so we count from its release date. The real gap is larger. Coverage before 2026 is thin (80 entries for 2025), so this count is a floor.

How to call it

2 ways to use Claude Sonnet 4, with the model id each provider expects.

Providers, model ids, endpoints and docs for Claude Sonnet 4
ProviderModel idEndpointDocs
Anthropic API (Claude API) claude-sonnet-4-20250514 https://api.anthropic.com/v1/messages platform.claude.com
OpenRouter anthropic/claude-sonnet-4 openrouter.ai

Pricing

Prices for Claude Sonnet 4
Input$3 per 1M tokens
Output$15 per 1M tokens

As published: “per 1M tokens (USD), Bedrock/Google Cloud may differ”.

Source: platform.claude.com, checked 29 September 2026.

Specs

Input
Text, images and PDF
Output
Text
Context window
200,000 tokens
Max output
Not published
Open weights
No
Licence
Proprietary
Training cutoff
Not published
Released
22 May 2025
Status
Retired
Type
Reasoning model

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Extended thinking with tool use

    First

    The Claude 4 generation introduced interleaving tool use (e.g. web search) with extended thinking, plus parallel tool calls.

    Source: anthropic.com

  • SOTA SWE-bench at launch

    72.7% on SWE-bench Verified; chosen by GitHub to power the Copilot coding agent.

    Source: anthropic.com

Notes

Retired on the Claude API 2026-06-15 (replacement claude-sonnet-4-6 / claude-sonnet-5-5); still available on Amazon Bedrock and Google Cloud per Anthropic pricing page.

Sources: https://platform.claude.com/docs/en/about-claude/model-deprecations , https://platform.claude.com/docs/en/about-claude/pricing

Not yet checked against an official source: Cloud ids not re-verified today.