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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 5.1.

RELEASE TIMELINE · AI MODEL RADAR Anthropic Anthropic · 8 versions · 2024 – 202616324763 8.73 OpusMar 2024 30.5Sonnet 4.6Feb 2026 40.7Opus 4.7Apr 2026 42.0Opus 4.8May 2026 49.7Fable 5Jun 2026 38.4Sonnet 5Jun 2026 50.7Opus 5Jul 2026 53.4Fable 5.1Aug 2026 aimodelradar.app · Intelligence Index: Artificial Analysis
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Anthropic Google OpenAI
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Claude Fable Gemini Flash Claude Opus Claude Sonnet GPT-5 Gemini Pro Claude Haiku GPT-4 OpenAI o-series

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