Claude Opus 4.1: claude Opus 4.5 shipped after Opus 4.1; this profile retains the Opus 4.1 identifier and specifications

The OnAirToday AI Progress Tracker recorded a verified change to Anthropic's Claude Opus 4.1 (version claude-opus-4-1-20250805): Claude Opus 4.5 shipped after Opus 4.1; this profile retains the Opus 4.1 identifier and specifications.

Claude Opus 4.1 is Anthropic’s August 2025 model for coding, research and agentic workflows, with a documented 200K-token context window. Its published SWE-bench Verified result is 74.5%; later Opus releases are separate models and do not change this version’s specifications.

What changed in this review:

• Added a reported Opus 4.1 production breach without attributing an undocumented exploit mechanism or extending it to other versions.
• Benchmark coverage excludes figures without sufficiently established model-specific published results.
• Capability score 57 → 75
• Risks and threats updated

Teams building on Claude Opus 4.1 should confirm limits, pricing and benchmark coverage against the vendor's own documentation before relying on these figures.

The full profile — capabilities, benchmark citations, known flaws and risk guidance — is on the tracker at /ai-models/claude-opus-4-1.

References:

• https://www.anthropic.com/news/claude-opus-4-1
• https://docs.anthropic.com/en/docs/about-claude/models/overview
• https://www.anthropic.com/news/claude-opus-4-5
• https://onairtoday.com/article/claude-opus-4-1-1-real-world-incident-documented-mvfy1hag