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AnthropicClaude 4 familyRetiredReasoning modelReleased 5 Aug 2025

Claude Opus 4.1

Retired on Anthropic-operated platforms; requests to claude-opus-4-1-20250805 on the Claude API fail. Listed for reference because it may still be reachable via Bedrock, Google Cloud or OpenRouter.

Model idclaude-opus-4-1-20250805

Price$15 in, $75 out per 1M tokens

Checked29 September 2026

No published training cutoff

At least2,007events since its release on 5 August 2025

88 historic, 463 major. 465 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 Opus 4.1, with the model id each provider expects.

Providers, model ids, endpoints and docs for Claude Opus 4.1
ProviderModel idEndpointDocs
Anthropic API (Claude API) claude-opus-4-1-20250805 https://api.anthropic.com/v1/messages platform.claude.com
OpenRouter anthropic/claude-opus-4.1 openrouter.ai

Pricing

Prices for Claude Opus 4.1
Input$15 per 1M tokens
Output$75 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
5 August 2025
Status
Retired
Type
Reasoning model

What stands out

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

  • SOTA SWE-bench Verified (Aug 2025)

    74.5% on SWE-bench Verified at launch.

    Source: anthropic.com

  • Precise multi-file refactoring

    GitHub and Rakuten highlighted multi-file refactoring and pinpoint fixes without unnecessary changes.

    Source: anthropic.com

Notes

Retired on the Claude API 2026-08-05 (replacement claude-opus-4-8 / claude-opus-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.