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Anthropic release timeline

8 releases across 2024 – 2026. Heights show the Artificial Analysis Intelligence Index for each release. The latest is Claude Fable 5.2.

RELEASE TIMELINE · AI MODEL RADAR Anthropic Anthropic · 8 versions · 2024 – 202617355270 8.73 OpusMar 2024 38.2Sonnet 5Jun 2026 50.8Opus 5Jul 2026 50.0Fable 5.1Aug 2026 59.1Opus 5.5Sep 2026 54.5Sonnet 5.5Sep 2026 36.5Haiku 5.5Oct 2026 Fable 5.2Nov 2026 aimodelradar.app · Intelligence Index: Artificial Analysis
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Anthropic OpenAI Google
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Claude Fable Claude Haiku Claude Sonnet GPT-6 Claude Opus Gemini Flash GPT-5 Gemini Pro GPT-4 OpenAI o-series

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