{
  "api_version": "1",
  "updated": "2026-10-17",
  "latest_event": "2026-10-15",
  "rights": "© Frontier Log, all rights reserved.",
  "story": {
    "slug": "claude-haiku-5-5",
    "title": "Claude Haiku 5.5",
    "url": "https://frontierlog.ai/stories/claude-haiku-5-5",
    "image": "https://frontierlog.ai/og/story-claude-haiku-5-5.png",
    "event": "2026-10-07-claude-haiku-5-5",
    "tags": [],
    "steps": [],
    "tables": [
      {
        "title": "Humanity's Last Exam, no tools",
        "unit": "%",
        "rows": [
          {
            "event": "2025-09-29-claude-sonnet-4-5",
            "date": "2025-09-29",
            "lab": "anthropic",
            "value": 17.7,
            "printed": "17.7%",
            "source": "https://www.anthropic.com/claude-opus-4-5-system-card",
            "where": "Figure 2.16.A 'Humanity's Last Exam (HLE)', panel 'Without Search', bar 'Sonnet 4.5' (page 32)"
          },
          {
            "event": "2025-10-15-claude-haiku-4-5",
            "date": "2025-10-15",
            "lab": "anthropic",
            "value": 10.2,
            "printed": "10.2%",
            "source": "https://www.anthropic.com/claude-haiku-5-5",
            "where": "Performance table, row 'Multidisciplinary reasoning, Humanity's Last Exam', column 'Haiku 4.5', 'no tools'"
          },
          {
            "event": "2025-11-24-claude-opus-4-5",
            "date": "2025-11-24",
            "lab": "anthropic",
            "value": 30.8,
            "printed": "30.8%",
            "source": "https://www.anthropic.com/claude-opus-4-5-system-card",
            "where": "Figure 2.16.A 'Humanity's Last Exam (HLE)', panel 'Without Search', bar 'Opus 4.5' (page 32)"
          },
          {
            "event": "2026-02-05-claude-opus-4-6",
            "date": "2026-02-05",
            "lab": "anthropic",
            "value": 40.0,
            "printed": "40.0%",
            "source": "https://www.anthropic.com/news/claude-opus-4-6",
            "where": "benchmark table (image), row 'Multidisciplinary reasoning, Humanity's Last Exam', column 'Opus 4.6', 'without tools'"
          },
          {
            "event": "2026-05-28-claude-opus-4-8",
            "date": "2026-05-28",
            "lab": "anthropic",
            "value": 49.8,
            "printed": "49.8%",
            "source": "https://www.anthropic.com/news/claude-opus-4-8",
            "where": "benchmark table (image), row 'Multidisciplinary reasoning, Humanity's Last Exam', column 'Opus 4.8', 'no tools'"
          },
          {
            "event": "2026-09-22-claude-opus-5-5",
            "date": "2026-09-22",
            "lab": "anthropic",
            "value": 64.4,
            "printed": "64.4",
            "source": "https://www.anthropic.com/claude-opus-5-5-system-card",
            "where": "Section 8.1 evaluation summary table, row 'Humanity's Last Exam, No tools', column 'Claude Opus 5.5'"
          },
          {
            "event": "2026-10-07-claude-haiku-5-5",
            "date": "2026-10-07",
            "lab": "anthropic",
            "value": 45.9,
            "printed": "45.9%",
            "source": "https://www.anthropic.com/claude-haiku-5-5",
            "where": "Performance table, row 'Multidisciplinary reasoning, Humanity's Last Exam', column 'Haiku 5.5', 'no tools'"
          },
          {
            "event": "2026-06-30-claude-sonnet-5",
            "date": "2026-06-30",
            "lab": "anthropic",
            "value": 43.2,
            "printed": "43.2%",
            "source": "https://www.anthropic.com/news/claude-sonnet-5",
            "where": "benchmark table (image), row 'Multidisciplinary reasoning, Humanity's Last Exam', column 'Sonnet 5', 'no tools'"
          },
          {
            "event": "2026-09-28-claude-sonnet-5-5",
            "date": "2026-09-28",
            "lab": "anthropic",
            "value": 56.9,
            "printed": "56.9",
            "source": "https://www.anthropic.com/claude-sonnet-5-5-system-card",
            "where": "Section 8.1 evaluation summary table, row 'Humanity's Last Exam, No tools', column 'Claude Sonnet 5.5'"
          }
        ]
      }
    ],
    "sources": [
      "https://www.anthropic.com/claude-haiku-5-5",
      "https://www.anthropic.com/claude-opus-4-5-system-card",
      "https://www.anthropic.com/claude-opus-5-5-system-card",
      "https://www.anthropic.com/claude-sonnet-5-5-system-card",
      "https://www.anthropic.com/news/claude-opus-4-6",
      "https://www.anthropic.com/news/claude-opus-4-8",
      "https://www.anthropic.com/news/claude-sonnet-5"
    ]
  }
}