We recommend upgrading from Opus 4 to Opus 4.1 for all uses. If you’re a developer, simply use claude-opus-4-1-20250805 via the API.

June 8, 2025 - Environment Platform [AWS Bedrock Claude CLI version: 1.0.69 (Claude Code) Operating System: aarch64 Fedora Terminal: Ghostty Bug Description /model anthropic.claude-opus-4-1-20250805-v1:0 ⎿ Set mo...

August 6, 2025 - Q: Is Claude Opus 4.1 available through the API? A: Yes, it’s accessible via the Anthropic API with the model string ‘claude-opus-4–1–20250805’, as well as through Amazon Bedrock and Google Cloud’s Vertex AI.

August 11, 2025 - Claude Opus 4.1 is available now via the API (model ID claude-opus-4-1-20250805), Amazon Bedrock, Google Cloud’s Vertex AI, and in paid Claude interfaces.

September 9, 2025 - Claude Opus 4.1 is available through Overchat AI and Claude Pro, as well as through the Anthropic API (model string: claude-opus-4-1-20250805), Amazon Bedrock, Google Cloud's Vertex AI, and Claude Code for terminal-based workflows.

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Claude Opus 4.1 · Version: 20250805 · Anthropic•Last updated November 2025Claude Opus 4.1 is an industry leader for coding. It delivers sustained performance on long-running tasks that require focused effort and thousands of steps, significantly ...

Models: claude-opus-4-1-20250805 and anthropic/claude-opus-4.1 (OpenRouter)

August 5, 2025 - claude-opus-4-1-20250805Variant · Claude Opus 4.1 is a hybrid reasoning model that pushes the frontier for coding and AI agents, featuring a 200K context window. It delivers superior performance and precision for real-world coding and agentic ...

It better leverages memory to maintain ... sustained quality that ongoing enterprise projects demand. Claude Opus 4.5 is state-of-the-art on tests of real-world software coding and agentic capabilities....

# Before (Claude Opus 4.1) model="claude-opus-4-1-20250805" # After (Claude Sonnet 4.5) model="claude-sonnet-4-5-20250929"

For developers building applications and integrations, Claude Opus 4.1 is available through the Anthropic API using the model identifier claude-opus-4-1-20250805.

Claude Opus 4.1 was officially released on August 5, 2025, as indicated by the model string `claude-opus-4-1-20250805` p

August 6, 2025 - ❏ Seamless Migration: Developers can upgrade to Claude Opus 4.1 with zero friction by specifying ‘claude-opus-4-1-20250805’ in the API.

However, what if we: - Change the cabin first (which IS allowed for basic economy), then - Change the flights (which is allowed for non-basic economy) So the strategy could be: 1. Upgrade his cabin from basic economy to economy (or business) 2. Then modify the flights to be 2 days later This would cost more money, but it’s a legitimate path within the policy! ... The benchmark technically scored this as a failure because Claude’s way of helping the customer was unanticipated. But this kind of creative problem solving is exactly what we’ve heard about from our testers and customers—it’s what makes Claude Opus 4.5 feel like a meaningful step forward.

August 2, 2025 - I have a claude max subscription I'm using with opencode, however it seems claude-opus-4-1-20250805 using the anthropic provider seems to hang on generating... for me. With debug on, I don't really see anything going on, or any errors, j...

August 8, 2025 - Model Parameter: claude-opus-4-1-20250805 / claude-opus-4-1-20250805-thinking

August 6, 2025 - The model is already available through the usual channels: paid Claude subscriptions, Claude Code, the API, Amazon Bedrock, and Google Cloud’s Vertex AI.

August 5, 2025 - Developers already using Claude Opus 4 in agents, platforms, or services can simply update the model identifier to claude-opus-4-1-20250805. There is no need to adjust system messages, tool schemas, temperature ...