Claude Opus 4.5: claude Opus 4.6 shipped on 5 February 2026; this profile remains specific to Opus 4.5

The OnAirToday AI Progress Tracker recorded a verified change to Anthropic's Claude Opus 4.5 (version claude-opus-4-5-20251101): Claude Opus 4.6 shipped on 5 February 2026; this profile remains specific to Opus 4.5.

Claude Opus 4.5 is an Anthropic model for software engineering, reasoning and tool-using agents, with a 200K-token context window and standard API pricing of $5 per million input tokens and $25 per million output tokens. Claude Opus 4.6 subsequently shipped on 5 February 2026; the specifications and benchmark results here remain specific to Opus 4.5.

What changed in this review:

• Terminal-Bench is identified as Terminal-Bench 2.0.
• Added a reported Opus 4.1 production breach as a family-level incident, without attributing the vulnerability to Opus 4.5.
• Capability score 66 → 76

Teams building on Claude Opus 4.5 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-4-5.

References:

• https://www.anthropic.com/news/claude-opus-4-5
• https://platform.claude.com/docs/en/about-claude/models/overview
• https://www.anthropic.com/news/claude-opus-4-6
• https://onairtoday.com/article/claude-opus-4-1-1-real-world-incident-documented-mvfy1hag