Claude Opus 4.1: claude Opus 4.5 shipped after Opus 4.1; this profile retains the Opus 4.1 identifier and specifications
The profile keeps its Opus 4.1 identifier and specifications despite the later Opus 4.5 release.
Claude Opus 4.5 shipped after Opus 4.1; this profile retains the Opus 4.1 identifier and specifications — verified by the OnAirToday AI Progress Tracker against Anthropic's published documentation.
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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. Anthropic subsequently released Claude Opus 4.5; the specifications and results here remain specific to Opus 4.1.
What changed in this review:
- Added Anthropic’s documented Claude Code extortion case, distinguishing family-level misuse from an Opus 4.1 security breach.
- Capability score 57 → 75
- Flaws and limitations updated
- 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://platform.claude.com/docs/en/about-claude/models/overview
- https://www.anthropic.com/news/detecting-countering-misuse-aug-2025
- https://www.anthropic.com/news/claude-opus-4-5
Generated insight by OnAirToday AI
Clear version labeling helps readers distinguish a model profile from later releases. It also reduces the risk of comparing specifications from different versions as if they described the same model.
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