{
 "slug": "Claude_Opus_5",
 "title": "Claude Opus 5",
 "type": "model",
 "short_desc": "Anthropic's July 2026 Opus release, positioned as approaching Claude Fable 5's capability at half its price; the first Opus-tier model of the Claude 5 generation.",
 "categories": [
  "Anthropic models",
  "Models",
  "Reasoning models",
  "2026 model releases"
 ],
 "infobox": {
  "Developer": "Anthropic",
  "Family": "Claude",
  "Predecessor": "Claude Opus 4.8",
  "Successor": "None as of July 2026",
  "Announced": "July 24, 2026",
  "Architecture": "Transformer-based hybrid reasoning model; details undisclosed",
  "Parameters": "Undisclosed",
  "Context window": "1,000,000 tokens; 128,000-token maximum output",
  "Knowledge cutoff": "May 2026",
  "Post-training": "Constitutional AI, RLHF-family, reasoning RL",
  "License / access": "Proprietary; API (claude-opus-5), claude.ai, Claude Code, cloud partners",
  "Paper/report": "Claude Opus 5 announcement (July 2026)"
 },
 "infobox_links": {
  "Developer": [
   "Anthropic"
  ],
  "Family": [
   "Claude_(model_family)"
  ],
  "Predecessor": [
   "Claude_Opus_4.8"
  ],
  "Architecture": [
   "Transformer_(architecture)"
  ],
  "Post-training": [
   "Constitutional_AI",
   "Reinforcement_learning_from_human_feedback"
  ]
 },
 "aliases": [
  "Opus 5"
 ],
 "family": "Claude (model family)",
 "org": "Anthropic",
 "registry_status": "stub",
 "words": 698,
 "references": 6,
 "outbound": [
  "Anthropic",
  "Claude_(model_family)",
  "Claude_Fable_5",
  "Claude_Opus_4.8",
  "Claude_Sonnet_5",
  "Constitutional_AI",
  "Large_language_model",
  "Reinforcement_learning_from_human_feedback",
  "Test-time_compute",
  "Transformer_(architecture)"
 ],
 "inbound": [
  "Claude_(model_family)",
  "Claude_Opus_4.8"
 ],
 "url": "wiki/Claude_Opus_5.html",
 "built": "2026-07-24"
}