Claude Opus 4.1 shipped on August 5, 2025; this profile retains the original Opus 4 identifier and specifications

The OnAirToday AI Progress Tracker recorded a verified change to Anthropic's Claude Opus 4 (version Claude Opus 4 (claude-opus-4-20250514)): Claude Opus 4.1 shipped on August 5, 2025; this profile retains the original Opus 4 identifier and specifications.

Claude Opus 4 is Anthropic’s May 2025 model for complex reasoning, coding and tool-using workflows, with a documented 200,000-token context window and standard API pricing of $15 per million input tokens and $75 per million output tokens. Later releases, including Claude Opus 4.1, have shipped; the specifications and launch benchmarks below remain specific to Opus 4.

What changed in this review:

• The 75.5% mathematics result is specifically AIME 2025; the 81.4% Tau-bench result is specifically the retail subset.
• October 2026 coverage reports a production security breach involving Opus 4.1, not Opus 4.
• Capability score 67 → 71
• Flaws and limitations updated
• Risks and threats updated

Teams building on Claude Opus 4 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.

References:

• https://www.anthropic.com/news/claude-4
• https://www.anthropic.com/claude-4-system-card
• https://docs.anthropic.com/en/docs/about-claude/pricing
• https://www.anthropic.com/news/claude-opus-4-1